CVE-2023-20070

mediumpriority · track · 16EPSS 0.005 · 45 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.54% (45th) EPSS

CVSS 4 · medium

Is it mine?

22 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

A vulnerability in the TLS 1.3 implementation of the Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 detection engine to unexpectedly restart. This vulnerability is due to a logic error in how memory allocations are handled during a TLS 1.3 session. Under specific, time-based constraints, an attacker could exploit this vulnerability by sending a crafted TLS 1.3 message sequence through an affected device. A successful exploit could allow the attacker to cause the Snort 3 detection engine to reload, resulting in a denial of service (DoS) condition. While the Snort detection engine reloads, packets going through the FTD device that are sent to the Snort detection engine will be dropped. The Snort detection engine will restart automatically. No manual intervention is required.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCisco Secure Firewall Threat Defense (FTD) Software 7.2.0 when installed on Cisco 3000 Series Industrial Security Appliances (ISA)cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Threat Defense (FTD) Software 7.2.0 when installed on Cisco Firepower 1000 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Threat Defense (FTD) Software 7.2.0 when installed on Cisco Firepower 2100 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Threat Defense (FTD) Software 7.2.0 when installed on Cisco Firepower 4100 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Threat Defense (FTD) Software 7.2.0 when installed on Cisco Firepower 9000 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Threat Defense (FTD) Software 7.2.0 when installed on Cisco Secure Firewall 3100 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Threat Defense (FTD) Software 7.2.0 when installed on Cisco Secure Firewall Threat Defense Virtualcisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1 when installed on Cisco 3000 Series Industrial Security Appliances (ISA)cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1 when installed on Cisco Firepower 1000 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1 when installed on Cisco Firepower 2100 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1 when installed on Cisco Firepower 4100 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1 when installed on Cisco Firepower 9000 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1 when installed on Cisco Secure Firewall 3100 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1 when installed on Cisco Secure Firewall Threat Defense Virtualcisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
WorkaroundCisco Secure Firewall Threat Defense (FTD) Software 7.2.0 when installed on Cisco 3000 Series Industrial Security Appliances (ISA)cisco_csaf
There are workarounds and mitigations that address this vulnerability. To remove the attack vector for this vulnerability, either of the following two options can be used. Only one of the two options needs to be applied. Revert to Snort 2 Disable TLS 1.3 Decryption Reverting to Snort 2 Before downgrading, review the Before you Begin section in the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Note: Downgrading to Snort 2 will delete customer policies, NAP customizations, and Hostname redirect in active authentications. To discuss the effects of reverting on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"]. Reverting to Snort 2 for Cisco FTD devices managed by FDM Software To revert to Snort 2 on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Device. In the Updates area, choose View Configuration. In the Intrusion Rule section, choose Downgrade to 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about reverting to Snort 2, see the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Reverting to Snort 2 for Cisco FTD devices managed by FMC Software To revert to Snort 2 on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Devices menu, choose Device Management. Choose the appropriate Cisco FTD device. Click the Edit pencil icon. Choose the Device tab. In the Inspection Engine area, choose Revert to Snort 2. After making the changes above, deploy changes to your FTD devices. For detailed information about reverting to Snort 2, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. Reverting to Snort 2 for Cisco FTD devices managed by Cisco Defense Orchestrator To revert to Snort 2 on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. In the navigation bar, click Inventory. Click the Devices tab. Click the FTD tab and click the device you want to revert. In the Device Actions pane located to the right, click Upgrade. Set the upgrade toggle to Intrusion Prevention Engine. Click Revert to Snort Engine 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about Cisco Defense Orchestrator managed devices, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about reverting to Snort 2 for Cisco FMC Devices managed with Cisco Defense Orchestrator, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. For detailed information about reverting to Snort 2 for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the Revert From Snort 3.0 for FDM-Managed Device ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/onboard-devices-and-services.html?bookSearch=true#Revert_From_Snort_3_for_FTD"] section of the Managing FDM Devices with Cisco Defense Orchestrator guide. Disabling TLS 1.3 Decryption This mitigation can affect your client and server connections. When TLS 1.3 decryption is disabled, the TLS connection downgrades to TLS 1.2 while matching the decryption rule. The effects on the deployment will depend on the clients and servers that will connect through the Cisco FTD device. To discuss the effects this will have on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"] . Disabling TLS 1.3 for Cisco FTD Software devices managed by FDM Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Policies. Choose the SSL Decryption tab. Click the SSL Decryption Settings button. Click on the Advanced tab. Disable the TLS 1.3 Decryption setting. Click OK. After changing the policy above, deploy the new policy to your Cisco FTD devices. For detailed information about TLS 1.3 decryption, see the Configure Advanced and Undecryptable Traffic Settings ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-ssl-decryption.html#Cisco_Task_in_List_GUI.dita_5d1e9ebe-75f2-4849-a2e8-54cf31e95c06"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Disabling TLS 1.3 for Cisco FTD Software devices managed by FMC Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Policies menu, choose SSL. Choose the appropriate SSL Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Uncheck the Enable TLS 1.3 Decryption box. Click Save to save your changes. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about TLS 1.3 decryption, see the SSL Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/device-config/720/management-center-device-config-72/encrypted-traffic-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section in the Cisco Secure Firewall Management Center Configuration Guide. Disabling TLS 1.3 for Cisco FTD Software devices managed by Cisco Defense Orchestrator To disable TLS 1.3 Decryption on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. From the Cisco Defense Orchestrator Policies menu, choose FTD Policies. From the FTD Policies menu, choose Decryption. Choose the appropriate Decryption Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Disable Enable TLS 1.3 Decryption. Click Save. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about devices managed by Cisco Defense Orchestrator, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about TLS 1.3 decryption, see the Decryption Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/cdo/cloud-delivered-firewall-management-center-in-cdo/managing-firewall-threat-defense-services-with-cisco-defense-orchestrator/m_decryption-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section of Managing Firewall Threat Defense with Cloud-Delivered Firewall Management Center in Cisco Defense Orchestrator. For detailed information about TLS 1.3 decryption for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the SSL Decryption Policy ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/configuring-ftd-devices.html#FTD_SSL_Decryption_Policy"] section of Managing FDM Devices with Cisco Defense Orchestrator. While these workarounds and mitigations have been deployed and were proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.
WorkaroundCisco Secure Firewall Threat Defense (FTD) Software 7.2.0 when installed on Cisco Firepower 1000 Seriescisco_csaf
There are workarounds and mitigations that address this vulnerability. To remove the attack vector for this vulnerability, either of the following two options can be used. Only one of the two options needs to be applied. Revert to Snort 2 Disable TLS 1.3 Decryption Reverting to Snort 2 Before downgrading, review the Before you Begin section in the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Note: Downgrading to Snort 2 will delete customer policies, NAP customizations, and Hostname redirect in active authentications. To discuss the effects of reverting on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"]. Reverting to Snort 2 for Cisco FTD devices managed by FDM Software To revert to Snort 2 on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Device. In the Updates area, choose View Configuration. In the Intrusion Rule section, choose Downgrade to 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about reverting to Snort 2, see the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Reverting to Snort 2 for Cisco FTD devices managed by FMC Software To revert to Snort 2 on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Devices menu, choose Device Management. Choose the appropriate Cisco FTD device. Click the Edit pencil icon. Choose the Device tab. In the Inspection Engine area, choose Revert to Snort 2. After making the changes above, deploy changes to your FTD devices. For detailed information about reverting to Snort 2, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. Reverting to Snort 2 for Cisco FTD devices managed by Cisco Defense Orchestrator To revert to Snort 2 on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. In the navigation bar, click Inventory. Click the Devices tab. Click the FTD tab and click the device you want to revert. In the Device Actions pane located to the right, click Upgrade. Set the upgrade toggle to Intrusion Prevention Engine. Click Revert to Snort Engine 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about Cisco Defense Orchestrator managed devices, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about reverting to Snort 2 for Cisco FMC Devices managed with Cisco Defense Orchestrator, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. For detailed information about reverting to Snort 2 for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the Revert From Snort 3.0 for FDM-Managed Device ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/onboard-devices-and-services.html?bookSearch=true#Revert_From_Snort_3_for_FTD"] section of the Managing FDM Devices with Cisco Defense Orchestrator guide. Disabling TLS 1.3 Decryption This mitigation can affect your client and server connections. When TLS 1.3 decryption is disabled, the TLS connection downgrades to TLS 1.2 while matching the decryption rule. The effects on the deployment will depend on the clients and servers that will connect through the Cisco FTD device. To discuss the effects this will have on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"] . Disabling TLS 1.3 for Cisco FTD Software devices managed by FDM Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Policies. Choose the SSL Decryption tab. Click the SSL Decryption Settings button. Click on the Advanced tab. Disable the TLS 1.3 Decryption setting. Click OK. After changing the policy above, deploy the new policy to your Cisco FTD devices. For detailed information about TLS 1.3 decryption, see the Configure Advanced and Undecryptable Traffic Settings ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-ssl-decryption.html#Cisco_Task_in_List_GUI.dita_5d1e9ebe-75f2-4849-a2e8-54cf31e95c06"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Disabling TLS 1.3 for Cisco FTD Software devices managed by FMC Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Policies menu, choose SSL. Choose the appropriate SSL Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Uncheck the Enable TLS 1.3 Decryption box. Click Save to save your changes. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about TLS 1.3 decryption, see the SSL Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/device-config/720/management-center-device-config-72/encrypted-traffic-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section in the Cisco Secure Firewall Management Center Configuration Guide. Disabling TLS 1.3 for Cisco FTD Software devices managed by Cisco Defense Orchestrator To disable TLS 1.3 Decryption on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. From the Cisco Defense Orchestrator Policies menu, choose FTD Policies. From the FTD Policies menu, choose Decryption. Choose the appropriate Decryption Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Disable Enable TLS 1.3 Decryption. Click Save. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about devices managed by Cisco Defense Orchestrator, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about TLS 1.3 decryption, see the Decryption Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/cdo/cloud-delivered-firewall-management-center-in-cdo/managing-firewall-threat-defense-services-with-cisco-defense-orchestrator/m_decryption-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section of Managing Firewall Threat Defense with Cloud-Delivered Firewall Management Center in Cisco Defense Orchestrator. For detailed information about TLS 1.3 decryption for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the SSL Decryption Policy ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/configuring-ftd-devices.html#FTD_SSL_Decryption_Policy"] section of Managing FDM Devices with Cisco Defense Orchestrator. While these workarounds and mitigations have been deployed and were proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.
WorkaroundCisco Secure Firewall Threat Defense (FTD) Software 7.2.0 when installed on Cisco Firepower 2100 Seriescisco_csaf
There are workarounds and mitigations that address this vulnerability. To remove the attack vector for this vulnerability, either of the following two options can be used. Only one of the two options needs to be applied. Revert to Snort 2 Disable TLS 1.3 Decryption Reverting to Snort 2 Before downgrading, review the Before you Begin section in the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Note: Downgrading to Snort 2 will delete customer policies, NAP customizations, and Hostname redirect in active authentications. To discuss the effects of reverting on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"]. Reverting to Snort 2 for Cisco FTD devices managed by FDM Software To revert to Snort 2 on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Device. In the Updates area, choose View Configuration. In the Intrusion Rule section, choose Downgrade to 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about reverting to Snort 2, see the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Reverting to Snort 2 for Cisco FTD devices managed by FMC Software To revert to Snort 2 on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Devices menu, choose Device Management. Choose the appropriate Cisco FTD device. Click the Edit pencil icon. Choose the Device tab. In the Inspection Engine area, choose Revert to Snort 2. After making the changes above, deploy changes to your FTD devices. For detailed information about reverting to Snort 2, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. Reverting to Snort 2 for Cisco FTD devices managed by Cisco Defense Orchestrator To revert to Snort 2 on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. In the navigation bar, click Inventory. Click the Devices tab. Click the FTD tab and click the device you want to revert. In the Device Actions pane located to the right, click Upgrade. Set the upgrade toggle to Intrusion Prevention Engine. Click Revert to Snort Engine 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about Cisco Defense Orchestrator managed devices, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about reverting to Snort 2 for Cisco FMC Devices managed with Cisco Defense Orchestrator, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. For detailed information about reverting to Snort 2 for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the Revert From Snort 3.0 for FDM-Managed Device ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/onboard-devices-and-services.html?bookSearch=true#Revert_From_Snort_3_for_FTD"] section of the Managing FDM Devices with Cisco Defense Orchestrator guide. Disabling TLS 1.3 Decryption This mitigation can affect your client and server connections. When TLS 1.3 decryption is disabled, the TLS connection downgrades to TLS 1.2 while matching the decryption rule. The effects on the deployment will depend on the clients and servers that will connect through the Cisco FTD device. To discuss the effects this will have on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"] . Disabling TLS 1.3 for Cisco FTD Software devices managed by FDM Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Policies. Choose the SSL Decryption tab. Click the SSL Decryption Settings button. Click on the Advanced tab. Disable the TLS 1.3 Decryption setting. Click OK. After changing the policy above, deploy the new policy to your Cisco FTD devices. For detailed information about TLS 1.3 decryption, see the Configure Advanced and Undecryptable Traffic Settings ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-ssl-decryption.html#Cisco_Task_in_List_GUI.dita_5d1e9ebe-75f2-4849-a2e8-54cf31e95c06"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Disabling TLS 1.3 for Cisco FTD Software devices managed by FMC Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Policies menu, choose SSL. Choose the appropriate SSL Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Uncheck the Enable TLS 1.3 Decryption box. Click Save to save your changes. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about TLS 1.3 decryption, see the SSL Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/device-config/720/management-center-device-config-72/encrypted-traffic-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section in the Cisco Secure Firewall Management Center Configuration Guide. Disabling TLS 1.3 for Cisco FTD Software devices managed by Cisco Defense Orchestrator To disable TLS 1.3 Decryption on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. From the Cisco Defense Orchestrator Policies menu, choose FTD Policies. From the FTD Policies menu, choose Decryption. Choose the appropriate Decryption Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Disable Enable TLS 1.3 Decryption. Click Save. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about devices managed by Cisco Defense Orchestrator, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about TLS 1.3 decryption, see the Decryption Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/cdo/cloud-delivered-firewall-management-center-in-cdo/managing-firewall-threat-defense-services-with-cisco-defense-orchestrator/m_decryption-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section of Managing Firewall Threat Defense with Cloud-Delivered Firewall Management Center in Cisco Defense Orchestrator. For detailed information about TLS 1.3 decryption for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the SSL Decryption Policy ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/configuring-ftd-devices.html#FTD_SSL_Decryption_Policy"] section of Managing FDM Devices with Cisco Defense Orchestrator. While these workarounds and mitigations have been deployed and were proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.
WorkaroundCisco Secure Firewall Threat Defense (FTD) Software 7.2.0 when installed on Cisco Firepower 4100 Seriescisco_csaf
There are workarounds and mitigations that address this vulnerability. To remove the attack vector for this vulnerability, either of the following two options can be used. Only one of the two options needs to be applied. Revert to Snort 2 Disable TLS 1.3 Decryption Reverting to Snort 2 Before downgrading, review the Before you Begin section in the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Note: Downgrading to Snort 2 will delete customer policies, NAP customizations, and Hostname redirect in active authentications. To discuss the effects of reverting on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"]. Reverting to Snort 2 for Cisco FTD devices managed by FDM Software To revert to Snort 2 on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Device. In the Updates area, choose View Configuration. In the Intrusion Rule section, choose Downgrade to 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about reverting to Snort 2, see the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Reverting to Snort 2 for Cisco FTD devices managed by FMC Software To revert to Snort 2 on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Devices menu, choose Device Management. Choose the appropriate Cisco FTD device. Click the Edit pencil icon. Choose the Device tab. In the Inspection Engine area, choose Revert to Snort 2. After making the changes above, deploy changes to your FTD devices. For detailed information about reverting to Snort 2, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. Reverting to Snort 2 for Cisco FTD devices managed by Cisco Defense Orchestrator To revert to Snort 2 on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. In the navigation bar, click Inventory. Click the Devices tab. Click the FTD tab and click the device you want to revert. In the Device Actions pane located to the right, click Upgrade. Set the upgrade toggle to Intrusion Prevention Engine. Click Revert to Snort Engine 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about Cisco Defense Orchestrator managed devices, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about reverting to Snort 2 for Cisco FMC Devices managed with Cisco Defense Orchestrator, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. For detailed information about reverting to Snort 2 for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the Revert From Snort 3.0 for FDM-Managed Device ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/onboard-devices-and-services.html?bookSearch=true#Revert_From_Snort_3_for_FTD"] section of the Managing FDM Devices with Cisco Defense Orchestrator guide. Disabling TLS 1.3 Decryption This mitigation can affect your client and server connections. When TLS 1.3 decryption is disabled, the TLS connection downgrades to TLS 1.2 while matching the decryption rule. The effects on the deployment will depend on the clients and servers that will connect through the Cisco FTD device. To discuss the effects this will have on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"] . Disabling TLS 1.3 for Cisco FTD Software devices managed by FDM Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Policies. Choose the SSL Decryption tab. Click the SSL Decryption Settings button. Click on the Advanced tab. Disable the TLS 1.3 Decryption setting. Click OK. After changing the policy above, deploy the new policy to your Cisco FTD devices. For detailed information about TLS 1.3 decryption, see the Configure Advanced and Undecryptable Traffic Settings ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-ssl-decryption.html#Cisco_Task_in_List_GUI.dita_5d1e9ebe-75f2-4849-a2e8-54cf31e95c06"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Disabling TLS 1.3 for Cisco FTD Software devices managed by FMC Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Policies menu, choose SSL. Choose the appropriate SSL Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Uncheck the Enable TLS 1.3 Decryption box. Click Save to save your changes. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about TLS 1.3 decryption, see the SSL Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/device-config/720/management-center-device-config-72/encrypted-traffic-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section in the Cisco Secure Firewall Management Center Configuration Guide. Disabling TLS 1.3 for Cisco FTD Software devices managed by Cisco Defense Orchestrator To disable TLS 1.3 Decryption on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. From the Cisco Defense Orchestrator Policies menu, choose FTD Policies. From the FTD Policies menu, choose Decryption. Choose the appropriate Decryption Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Disable Enable TLS 1.3 Decryption. Click Save. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about devices managed by Cisco Defense Orchestrator, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about TLS 1.3 decryption, see the Decryption Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/cdo/cloud-delivered-firewall-management-center-in-cdo/managing-firewall-threat-defense-services-with-cisco-defense-orchestrator/m_decryption-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section of Managing Firewall Threat Defense with Cloud-Delivered Firewall Management Center in Cisco Defense Orchestrator. For detailed information about TLS 1.3 decryption for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the SSL Decryption Policy ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/configuring-ftd-devices.html#FTD_SSL_Decryption_Policy"] section of Managing FDM Devices with Cisco Defense Orchestrator. While these workarounds and mitigations have been deployed and were proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.
WorkaroundCisco Secure Firewall Threat Defense (FTD) Software 7.2.0 when installed on Cisco Firepower 9000 Seriescisco_csaf
There are workarounds and mitigations that address this vulnerability. To remove the attack vector for this vulnerability, either of the following two options can be used. Only one of the two options needs to be applied. Revert to Snort 2 Disable TLS 1.3 Decryption Reverting to Snort 2 Before downgrading, review the Before you Begin section in the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Note: Downgrading to Snort 2 will delete customer policies, NAP customizations, and Hostname redirect in active authentications. To discuss the effects of reverting on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"]. Reverting to Snort 2 for Cisco FTD devices managed by FDM Software To revert to Snort 2 on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Device. In the Updates area, choose View Configuration. In the Intrusion Rule section, choose Downgrade to 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about reverting to Snort 2, see the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Reverting to Snort 2 for Cisco FTD devices managed by FMC Software To revert to Snort 2 on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Devices menu, choose Device Management. Choose the appropriate Cisco FTD device. Click the Edit pencil icon. Choose the Device tab. In the Inspection Engine area, choose Revert to Snort 2. After making the changes above, deploy changes to your FTD devices. For detailed information about reverting to Snort 2, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. Reverting to Snort 2 for Cisco FTD devices managed by Cisco Defense Orchestrator To revert to Snort 2 on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. In the navigation bar, click Inventory. Click the Devices tab. Click the FTD tab and click the device you want to revert. In the Device Actions pane located to the right, click Upgrade. Set the upgrade toggle to Intrusion Prevention Engine. Click Revert to Snort Engine 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about Cisco Defense Orchestrator managed devices, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about reverting to Snort 2 for Cisco FMC Devices managed with Cisco Defense Orchestrator, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. For detailed information about reverting to Snort 2 for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the Revert From Snort 3.0 for FDM-Managed Device ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/onboard-devices-and-services.html?bookSearch=true#Revert_From_Snort_3_for_FTD"] section of the Managing FDM Devices with Cisco Defense Orchestrator guide. Disabling TLS 1.3 Decryption This mitigation can affect your client and server connections. When TLS 1.3 decryption is disabled, the TLS connection downgrades to TLS 1.2 while matching the decryption rule. The effects on the deployment will depend on the clients and servers that will connect through the Cisco FTD device. To discuss the effects this will have on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"] . Disabling TLS 1.3 for Cisco FTD Software devices managed by FDM Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Policies. Choose the SSL Decryption tab. Click the SSL Decryption Settings button. Click on the Advanced tab. Disable the TLS 1.3 Decryption setting. Click OK. After changing the policy above, deploy the new policy to your Cisco FTD devices. For detailed information about TLS 1.3 decryption, see the Configure Advanced and Undecryptable Traffic Settings ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-ssl-decryption.html#Cisco_Task_in_List_GUI.dita_5d1e9ebe-75f2-4849-a2e8-54cf31e95c06"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Disabling TLS 1.3 for Cisco FTD Software devices managed by FMC Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Policies menu, choose SSL. Choose the appropriate SSL Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Uncheck the Enable TLS 1.3 Decryption box. Click Save to save your changes. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about TLS 1.3 decryption, see the SSL Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/device-config/720/management-center-device-config-72/encrypted-traffic-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section in the Cisco Secure Firewall Management Center Configuration Guide. Disabling TLS 1.3 for Cisco FTD Software devices managed by Cisco Defense Orchestrator To disable TLS 1.3 Decryption on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. From the Cisco Defense Orchestrator Policies menu, choose FTD Policies. From the FTD Policies menu, choose Decryption. Choose the appropriate Decryption Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Disable Enable TLS 1.3 Decryption. Click Save. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about devices managed by Cisco Defense Orchestrator, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about TLS 1.3 decryption, see the Decryption Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/cdo/cloud-delivered-firewall-management-center-in-cdo/managing-firewall-threat-defense-services-with-cisco-defense-orchestrator/m_decryption-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section of Managing Firewall Threat Defense with Cloud-Delivered Firewall Management Center in Cisco Defense Orchestrator. For detailed information about TLS 1.3 decryption for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the SSL Decryption Policy ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/configuring-ftd-devices.html#FTD_SSL_Decryption_Policy"] section of Managing FDM Devices with Cisco Defense Orchestrator. While these workarounds and mitigations have been deployed and were proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.
WorkaroundCisco Secure Firewall Threat Defense (FTD) Software 7.2.0 when installed on Cisco Secure Firewall 3100 Seriescisco_csaf
There are workarounds and mitigations that address this vulnerability. To remove the attack vector for this vulnerability, either of the following two options can be used. Only one of the two options needs to be applied. Revert to Snort 2 Disable TLS 1.3 Decryption Reverting to Snort 2 Before downgrading, review the Before you Begin section in the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Note: Downgrading to Snort 2 will delete customer policies, NAP customizations, and Hostname redirect in active authentications. To discuss the effects of reverting on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"]. Reverting to Snort 2 for Cisco FTD devices managed by FDM Software To revert to Snort 2 on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Device. In the Updates area, choose View Configuration. In the Intrusion Rule section, choose Downgrade to 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about reverting to Snort 2, see the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Reverting to Snort 2 for Cisco FTD devices managed by FMC Software To revert to Snort 2 on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Devices menu, choose Device Management. Choose the appropriate Cisco FTD device. Click the Edit pencil icon. Choose the Device tab. In the Inspection Engine area, choose Revert to Snort 2. After making the changes above, deploy changes to your FTD devices. For detailed information about reverting to Snort 2, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. Reverting to Snort 2 for Cisco FTD devices managed by Cisco Defense Orchestrator To revert to Snort 2 on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. In the navigation bar, click Inventory. Click the Devices tab. Click the FTD tab and click the device you want to revert. In the Device Actions pane located to the right, click Upgrade. Set the upgrade toggle to Intrusion Prevention Engine. Click Revert to Snort Engine 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about Cisco Defense Orchestrator managed devices, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about reverting to Snort 2 for Cisco FMC Devices managed with Cisco Defense Orchestrator, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. For detailed information about reverting to Snort 2 for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the Revert From Snort 3.0 for FDM-Managed Device ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/onboard-devices-and-services.html?bookSearch=true#Revert_From_Snort_3_for_FTD"] section of the Managing FDM Devices with Cisco Defense Orchestrator guide. Disabling TLS 1.3 Decryption This mitigation can affect your client and server connections. When TLS 1.3 decryption is disabled, the TLS connection downgrades to TLS 1.2 while matching the decryption rule. The effects on the deployment will depend on the clients and servers that will connect through the Cisco FTD device. To discuss the effects this will have on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"] . Disabling TLS 1.3 for Cisco FTD Software devices managed by FDM Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Policies. Choose the SSL Decryption tab. Click the SSL Decryption Settings button. Click on the Advanced tab. Disable the TLS 1.3 Decryption setting. Click OK. After changing the policy above, deploy the new policy to your Cisco FTD devices. For detailed information about TLS 1.3 decryption, see the Configure Advanced and Undecryptable Traffic Settings ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-ssl-decryption.html#Cisco_Task_in_List_GUI.dita_5d1e9ebe-75f2-4849-a2e8-54cf31e95c06"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Disabling TLS 1.3 for Cisco FTD Software devices managed by FMC Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Policies menu, choose SSL. Choose the appropriate SSL Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Uncheck the Enable TLS 1.3 Decryption box. Click Save to save your changes. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about TLS 1.3 decryption, see the SSL Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/device-config/720/management-center-device-config-72/encrypted-traffic-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section in the Cisco Secure Firewall Management Center Configuration Guide. Disabling TLS 1.3 for Cisco FTD Software devices managed by Cisco Defense Orchestrator To disable TLS 1.3 Decryption on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. From the Cisco Defense Orchestrator Policies menu, choose FTD Policies. From the FTD Policies menu, choose Decryption. Choose the appropriate Decryption Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Disable Enable TLS 1.3 Decryption. Click Save. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about devices managed by Cisco Defense Orchestrator, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about TLS 1.3 decryption, see the Decryption Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/cdo/cloud-delivered-firewall-management-center-in-cdo/managing-firewall-threat-defense-services-with-cisco-defense-orchestrator/m_decryption-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section of Managing Firewall Threat Defense with Cloud-Delivered Firewall Management Center in Cisco Defense Orchestrator. For detailed information about TLS 1.3 decryption for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the SSL Decryption Policy ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/configuring-ftd-devices.html#FTD_SSL_Decryption_Policy"] section of Managing FDM Devices with Cisco Defense Orchestrator. While these workarounds and mitigations have been deployed and were proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.
WorkaroundCisco Secure Firewall Threat Defense (FTD) Software 7.2.0 when installed on Cisco Secure Firewall Threat Defense Virtualcisco_csaf
There are workarounds and mitigations that address this vulnerability. To remove the attack vector for this vulnerability, either of the following two options can be used. Only one of the two options needs to be applied. Revert to Snort 2 Disable TLS 1.3 Decryption Reverting to Snort 2 Before downgrading, review the Before you Begin section in the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Note: Downgrading to Snort 2 will delete customer policies, NAP customizations, and Hostname redirect in active authentications. To discuss the effects of reverting on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"]. Reverting to Snort 2 for Cisco FTD devices managed by FDM Software To revert to Snort 2 on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Device. In the Updates area, choose View Configuration. In the Intrusion Rule section, choose Downgrade to 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about reverting to Snort 2, see the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Reverting to Snort 2 for Cisco FTD devices managed by FMC Software To revert to Snort 2 on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Devices menu, choose Device Management. Choose the appropriate Cisco FTD device. Click the Edit pencil icon. Choose the Device tab. In the Inspection Engine area, choose Revert to Snort 2. After making the changes above, deploy changes to your FTD devices. For detailed information about reverting to Snort 2, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. Reverting to Snort 2 for Cisco FTD devices managed by Cisco Defense Orchestrator To revert to Snort 2 on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. In the navigation bar, click Inventory. Click the Devices tab. Click the FTD tab and click the device you want to revert. In the Device Actions pane located to the right, click Upgrade. Set the upgrade toggle to Intrusion Prevention Engine. Click Revert to Snort Engine 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about Cisco Defense Orchestrator managed devices, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about reverting to Snort 2 for Cisco FMC Devices managed with Cisco Defense Orchestrator, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. For detailed information about reverting to Snort 2 for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the Revert From Snort 3.0 for FDM-Managed Device ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/onboard-devices-and-services.html?bookSearch=true#Revert_From_Snort_3_for_FTD"] section of the Managing FDM Devices with Cisco Defense Orchestrator guide. Disabling TLS 1.3 Decryption This mitigation can affect your client and server connections. When TLS 1.3 decryption is disabled, the TLS connection downgrades to TLS 1.2 while matching the decryption rule. The effects on the deployment will depend on the clients and servers that will connect through the Cisco FTD device. To discuss the effects this will have on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"] . Disabling TLS 1.3 for Cisco FTD Software devices managed by FDM Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Policies. Choose the SSL Decryption tab. Click the SSL Decryption Settings button. Click on the Advanced tab. Disable the TLS 1.3 Decryption setting. Click OK. After changing the policy above, deploy the new policy to your Cisco FTD devices. For detailed information about TLS 1.3 decryption, see the Configure Advanced and Undecryptable Traffic Settings ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-ssl-decryption.html#Cisco_Task_in_List_GUI.dita_5d1e9ebe-75f2-4849-a2e8-54cf31e95c06"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Disabling TLS 1.3 for Cisco FTD Software devices managed by FMC Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Policies menu, choose SSL. Choose the appropriate SSL Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Uncheck the Enable TLS 1.3 Decryption box. Click Save to save your changes. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about TLS 1.3 decryption, see the SSL Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/device-config/720/management-center-device-config-72/encrypted-traffic-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section in the Cisco Secure Firewall Management Center Configuration Guide. Disabling TLS 1.3 for Cisco FTD Software devices managed by Cisco Defense Orchestrator To disable TLS 1.3 Decryption on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. From the Cisco Defense Orchestrator Policies menu, choose FTD Policies. From the FTD Policies menu, choose Decryption. Choose the appropriate Decryption Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Disable Enable TLS 1.3 Decryption. Click Save. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about devices managed by Cisco Defense Orchestrator, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about TLS 1.3 decryption, see the Decryption Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/cdo/cloud-delivered-firewall-management-center-in-cdo/managing-firewall-threat-defense-services-with-cisco-defense-orchestrator/m_decryption-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section of Managing Firewall Threat Defense with Cloud-Delivered Firewall Management Center in Cisco Defense Orchestrator. For detailed information about TLS 1.3 decryption for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the SSL Decryption Policy ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/configuring-ftd-devices.html#FTD_SSL_Decryption_Policy"] section of Managing FDM Devices with Cisco Defense Orchestrator. While these workarounds and mitigations have been deployed and were proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.
WorkaroundCisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1 when installed on Cisco 3000 Series Industrial Security Appliances (ISA)cisco_csaf
There are workarounds and mitigations that address this vulnerability. To remove the attack vector for this vulnerability, either of the following two options can be used. Only one of the two options needs to be applied. Revert to Snort 2 Disable TLS 1.3 Decryption Reverting to Snort 2 Before downgrading, review the Before you Begin section in the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Note: Downgrading to Snort 2 will delete customer policies, NAP customizations, and Hostname redirect in active authentications. To discuss the effects of reverting on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"]. Reverting to Snort 2 for Cisco FTD devices managed by FDM Software To revert to Snort 2 on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Device. In the Updates area, choose View Configuration. In the Intrusion Rule section, choose Downgrade to 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about reverting to Snort 2, see the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Reverting to Snort 2 for Cisco FTD devices managed by FMC Software To revert to Snort 2 on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Devices menu, choose Device Management. Choose the appropriate Cisco FTD device. Click the Edit pencil icon. Choose the Device tab. In the Inspection Engine area, choose Revert to Snort 2. After making the changes above, deploy changes to your FTD devices. For detailed information about reverting to Snort 2, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. Reverting to Snort 2 for Cisco FTD devices managed by Cisco Defense Orchestrator To revert to Snort 2 on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. In the navigation bar, click Inventory. Click the Devices tab. Click the FTD tab and click the device you want to revert. In the Device Actions pane located to the right, click Upgrade. Set the upgrade toggle to Intrusion Prevention Engine. Click Revert to Snort Engine 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about Cisco Defense Orchestrator managed devices, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about reverting to Snort 2 for Cisco FMC Devices managed with Cisco Defense Orchestrator, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. For detailed information about reverting to Snort 2 for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the Revert From Snort 3.0 for FDM-Managed Device ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/onboard-devices-and-services.html?bookSearch=true#Revert_From_Snort_3_for_FTD"] section of the Managing FDM Devices with Cisco Defense Orchestrator guide. Disabling TLS 1.3 Decryption This mitigation can affect your client and server connections. When TLS 1.3 decryption is disabled, the TLS connection downgrades to TLS 1.2 while matching the decryption rule. The effects on the deployment will depend on the clients and servers that will connect through the Cisco FTD device. To discuss the effects this will have on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"] . Disabling TLS 1.3 for Cisco FTD Software devices managed by FDM Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Policies. Choose the SSL Decryption tab. Click the SSL Decryption Settings button. Click on the Advanced tab. Disable the TLS 1.3 Decryption setting. Click OK. After changing the policy above, deploy the new policy to your Cisco FTD devices. For detailed information about TLS 1.3 decryption, see the Configure Advanced and Undecryptable Traffic Settings ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-ssl-decryption.html#Cisco_Task_in_List_GUI.dita_5d1e9ebe-75f2-4849-a2e8-54cf31e95c06"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Disabling TLS 1.3 for Cisco FTD Software devices managed by FMC Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Policies menu, choose SSL. Choose the appropriate SSL Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Uncheck the Enable TLS 1.3 Decryption box. Click Save to save your changes. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about TLS 1.3 decryption, see the SSL Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/device-config/720/management-center-device-config-72/encrypted-traffic-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section in the Cisco Secure Firewall Management Center Configuration Guide. Disabling TLS 1.3 for Cisco FTD Software devices managed by Cisco Defense Orchestrator To disable TLS 1.3 Decryption on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. From the Cisco Defense Orchestrator Policies menu, choose FTD Policies. From the FTD Policies menu, choose Decryption. Choose the appropriate Decryption Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Disable Enable TLS 1.3 Decryption. Click Save. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about devices managed by Cisco Defense Orchestrator, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about TLS 1.3 decryption, see the Decryption Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/cdo/cloud-delivered-firewall-management-center-in-cdo/managing-firewall-threat-defense-services-with-cisco-defense-orchestrator/m_decryption-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section of Managing Firewall Threat Defense with Cloud-Delivered Firewall Management Center in Cisco Defense Orchestrator. For detailed information about TLS 1.3 decryption for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the SSL Decryption Policy ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/configuring-ftd-devices.html#FTD_SSL_Decryption_Policy"] section of Managing FDM Devices with Cisco Defense Orchestrator. While these workarounds and mitigations have been deployed and were proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.
WorkaroundCisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1 when installed on Cisco Firepower 1000 Seriescisco_csaf
There are workarounds and mitigations that address this vulnerability. To remove the attack vector for this vulnerability, either of the following two options can be used. Only one of the two options needs to be applied. Revert to Snort 2 Disable TLS 1.3 Decryption Reverting to Snort 2 Before downgrading, review the Before you Begin section in the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Note: Downgrading to Snort 2 will delete customer policies, NAP customizations, and Hostname redirect in active authentications. To discuss the effects of reverting on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"]. Reverting to Snort 2 for Cisco FTD devices managed by FDM Software To revert to Snort 2 on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Device. In the Updates area, choose View Configuration. In the Intrusion Rule section, choose Downgrade to 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about reverting to Snort 2, see the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Reverting to Snort 2 for Cisco FTD devices managed by FMC Software To revert to Snort 2 on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Devices menu, choose Device Management. Choose the appropriate Cisco FTD device. Click the Edit pencil icon. Choose the Device tab. In the Inspection Engine area, choose Revert to Snort 2. After making the changes above, deploy changes to your FTD devices. For detailed information about reverting to Snort 2, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. Reverting to Snort 2 for Cisco FTD devices managed by Cisco Defense Orchestrator To revert to Snort 2 on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. In the navigation bar, click Inventory. Click the Devices tab. Click the FTD tab and click the device you want to revert. In the Device Actions pane located to the right, click Upgrade. Set the upgrade toggle to Intrusion Prevention Engine. Click Revert to Snort Engine 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about Cisco Defense Orchestrator managed devices, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about reverting to Snort 2 for Cisco FMC Devices managed with Cisco Defense Orchestrator, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. For detailed information about reverting to Snort 2 for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the Revert From Snort 3.0 for FDM-Managed Device ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/onboard-devices-and-services.html?bookSearch=true#Revert_From_Snort_3_for_FTD"] section of the Managing FDM Devices with Cisco Defense Orchestrator guide. Disabling TLS 1.3 Decryption This mitigation can affect your client and server connections. When TLS 1.3 decryption is disabled, the TLS connection downgrades to TLS 1.2 while matching the decryption rule. The effects on the deployment will depend on the clients and servers that will connect through the Cisco FTD device. To discuss the effects this will have on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"] . Disabling TLS 1.3 for Cisco FTD Software devices managed by FDM Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Policies. Choose the SSL Decryption tab. Click the SSL Decryption Settings button. Click on the Advanced tab. Disable the TLS 1.3 Decryption setting. Click OK. After changing the policy above, deploy the new policy to your Cisco FTD devices. For detailed information about TLS 1.3 decryption, see the Configure Advanced and Undecryptable Traffic Settings ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-ssl-decryption.html#Cisco_Task_in_List_GUI.dita_5d1e9ebe-75f2-4849-a2e8-54cf31e95c06"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Disabling TLS 1.3 for Cisco FTD Software devices managed by FMC Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Policies menu, choose SSL. Choose the appropriate SSL Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Uncheck the Enable TLS 1.3 Decryption box. Click Save to save your changes. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about TLS 1.3 decryption, see the SSL Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/device-config/720/management-center-device-config-72/encrypted-traffic-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section in the Cisco Secure Firewall Management Center Configuration Guide. Disabling TLS 1.3 for Cisco FTD Software devices managed by Cisco Defense Orchestrator To disable TLS 1.3 Decryption on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. From the Cisco Defense Orchestrator Policies menu, choose FTD Policies. From the FTD Policies menu, choose Decryption. Choose the appropriate Decryption Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Disable Enable TLS 1.3 Decryption. Click Save. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about devices managed by Cisco Defense Orchestrator, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about TLS 1.3 decryption, see the Decryption Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/cdo/cloud-delivered-firewall-management-center-in-cdo/managing-firewall-threat-defense-services-with-cisco-defense-orchestrator/m_decryption-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section of Managing Firewall Threat Defense with Cloud-Delivered Firewall Management Center in Cisco Defense Orchestrator. For detailed information about TLS 1.3 decryption for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the SSL Decryption Policy ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/configuring-ftd-devices.html#FTD_SSL_Decryption_Policy"] section of Managing FDM Devices with Cisco Defense Orchestrator. While these workarounds and mitigations have been deployed and were proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.
WorkaroundCisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1 when installed on Cisco Firepower 2100 Seriescisco_csaf
There are workarounds and mitigations that address this vulnerability. To remove the attack vector for this vulnerability, either of the following two options can be used. Only one of the two options needs to be applied. Revert to Snort 2 Disable TLS 1.3 Decryption Reverting to Snort 2 Before downgrading, review the Before you Begin section in the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Note: Downgrading to Snort 2 will delete customer policies, NAP customizations, and Hostname redirect in active authentications. To discuss the effects of reverting on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"]. Reverting to Snort 2 for Cisco FTD devices managed by FDM Software To revert to Snort 2 on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Device. In the Updates area, choose View Configuration. In the Intrusion Rule section, choose Downgrade to 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about reverting to Snort 2, see the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Reverting to Snort 2 for Cisco FTD devices managed by FMC Software To revert to Snort 2 on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Devices menu, choose Device Management. Choose the appropriate Cisco FTD device. Click the Edit pencil icon. Choose the Device tab. In the Inspection Engine area, choose Revert to Snort 2. After making the changes above, deploy changes to your FTD devices. For detailed information about reverting to Snort 2, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. Reverting to Snort 2 for Cisco FTD devices managed by Cisco Defense Orchestrator To revert to Snort 2 on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. In the navigation bar, click Inventory. Click the Devices tab. Click the FTD tab and click the device you want to revert. In the Device Actions pane located to the right, click Upgrade. Set the upgrade toggle to Intrusion Prevention Engine. Click Revert to Snort Engine 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about Cisco Defense Orchestrator managed devices, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about reverting to Snort 2 for Cisco FMC Devices managed with Cisco Defense Orchestrator, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. For detailed information about reverting to Snort 2 for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the Revert From Snort 3.0 for FDM-Managed Device ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/onboard-devices-and-services.html?bookSearch=true#Revert_From_Snort_3_for_FTD"] section of the Managing FDM Devices with Cisco Defense Orchestrator guide. Disabling TLS 1.3 Decryption This mitigation can affect your client and server connections. When TLS 1.3 decryption is disabled, the TLS connection downgrades to TLS 1.2 while matching the decryption rule. The effects on the deployment will depend on the clients and servers that will connect through the Cisco FTD device. To discuss the effects this will have on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"] . Disabling TLS 1.3 for Cisco FTD Software devices managed by FDM Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Policies. Choose the SSL Decryption tab. Click the SSL Decryption Settings button. Click on the Advanced tab. Disable the TLS 1.3 Decryption setting. Click OK. After changing the policy above, deploy the new policy to your Cisco FTD devices. For detailed information about TLS 1.3 decryption, see the Configure Advanced and Undecryptable Traffic Settings ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-ssl-decryption.html#Cisco_Task_in_List_GUI.dita_5d1e9ebe-75f2-4849-a2e8-54cf31e95c06"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Disabling TLS 1.3 for Cisco FTD Software devices managed by FMC Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Policies menu, choose SSL. Choose the appropriate SSL Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Uncheck the Enable TLS 1.3 Decryption box. Click Save to save your changes. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about TLS 1.3 decryption, see the SSL Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/device-config/720/management-center-device-config-72/encrypted-traffic-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section in the Cisco Secure Firewall Management Center Configuration Guide. Disabling TLS 1.3 for Cisco FTD Software devices managed by Cisco Defense Orchestrator To disable TLS 1.3 Decryption on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. From the Cisco Defense Orchestrator Policies menu, choose FTD Policies. From the FTD Policies menu, choose Decryption. Choose the appropriate Decryption Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Disable Enable TLS 1.3 Decryption. Click Save. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about devices managed by Cisco Defense Orchestrator, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about TLS 1.3 decryption, see the Decryption Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/cdo/cloud-delivered-firewall-management-center-in-cdo/managing-firewall-threat-defense-services-with-cisco-defense-orchestrator/m_decryption-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section of Managing Firewall Threat Defense with Cloud-Delivered Firewall Management Center in Cisco Defense Orchestrator. For detailed information about TLS 1.3 decryption for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the SSL Decryption Policy ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/configuring-ftd-devices.html#FTD_SSL_Decryption_Policy"] section of Managing FDM Devices with Cisco Defense Orchestrator. While these workarounds and mitigations have been deployed and were proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.
WorkaroundCisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1 when installed on Cisco Firepower 4100 Seriescisco_csaf
There are workarounds and mitigations that address this vulnerability. To remove the attack vector for this vulnerability, either of the following two options can be used. Only one of the two options needs to be applied. Revert to Snort 2 Disable TLS 1.3 Decryption Reverting to Snort 2 Before downgrading, review the Before you Begin section in the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Note: Downgrading to Snort 2 will delete customer policies, NAP customizations, and Hostname redirect in active authentications. To discuss the effects of reverting on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"]. Reverting to Snort 2 for Cisco FTD devices managed by FDM Software To revert to Snort 2 on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Device. In the Updates area, choose View Configuration. In the Intrusion Rule section, choose Downgrade to 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about reverting to Snort 2, see the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Reverting to Snort 2 for Cisco FTD devices managed by FMC Software To revert to Snort 2 on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Devices menu, choose Device Management. Choose the appropriate Cisco FTD device. Click the Edit pencil icon. Choose the Device tab. In the Inspection Engine area, choose Revert to Snort 2. After making the changes above, deploy changes to your FTD devices. For detailed information about reverting to Snort 2, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. Reverting to Snort 2 for Cisco FTD devices managed by Cisco Defense Orchestrator To revert to Snort 2 on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. In the navigation bar, click Inventory. Click the Devices tab. Click the FTD tab and click the device you want to revert. In the Device Actions pane located to the right, click Upgrade. Set the upgrade toggle to Intrusion Prevention Engine. Click Revert to Snort Engine 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about Cisco Defense Orchestrator managed devices, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about reverting to Snort 2 for Cisco FMC Devices managed with Cisco Defense Orchestrator, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. For detailed information about reverting to Snort 2 for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the Revert From Snort 3.0 for FDM-Managed Device ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/onboard-devices-and-services.html?bookSearch=true#Revert_From_Snort_3_for_FTD"] section of the Managing FDM Devices with Cisco Defense Orchestrator guide. Disabling TLS 1.3 Decryption This mitigation can affect your client and server connections. When TLS 1.3 decryption is disabled, the TLS connection downgrades to TLS 1.2 while matching the decryption rule. The effects on the deployment will depend on the clients and servers that will connect through the Cisco FTD device. To discuss the effects this will have on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"] . Disabling TLS 1.3 for Cisco FTD Software devices managed by FDM Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Policies. Choose the SSL Decryption tab. Click the SSL Decryption Settings button. Click on the Advanced tab. Disable the TLS 1.3 Decryption setting. Click OK. After changing the policy above, deploy the new policy to your Cisco FTD devices. For detailed information about TLS 1.3 decryption, see the Configure Advanced and Undecryptable Traffic Settings ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-ssl-decryption.html#Cisco_Task_in_List_GUI.dita_5d1e9ebe-75f2-4849-a2e8-54cf31e95c06"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Disabling TLS 1.3 for Cisco FTD Software devices managed by FMC Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Policies menu, choose SSL. Choose the appropriate SSL Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Uncheck the Enable TLS 1.3 Decryption box. Click Save to save your changes. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about TLS 1.3 decryption, see the SSL Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/device-config/720/management-center-device-config-72/encrypted-traffic-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section in the Cisco Secure Firewall Management Center Configuration Guide. Disabling TLS 1.3 for Cisco FTD Software devices managed by Cisco Defense Orchestrator To disable TLS 1.3 Decryption on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. From the Cisco Defense Orchestrator Policies menu, choose FTD Policies. From the FTD Policies menu, choose Decryption. Choose the appropriate Decryption Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Disable Enable TLS 1.3 Decryption. Click Save. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about devices managed by Cisco Defense Orchestrator, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about TLS 1.3 decryption, see the Decryption Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/cdo/cloud-delivered-firewall-management-center-in-cdo/managing-firewall-threat-defense-services-with-cisco-defense-orchestrator/m_decryption-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section of Managing Firewall Threat Defense with Cloud-Delivered Firewall Management Center in Cisco Defense Orchestrator. For detailed information about TLS 1.3 decryption for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the SSL Decryption Policy ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/configuring-ftd-devices.html#FTD_SSL_Decryption_Policy"] section of Managing FDM Devices with Cisco Defense Orchestrator. While these workarounds and mitigations have been deployed and were proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.
WorkaroundCisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1 when installed on Cisco Firepower 9000 Seriescisco_csaf
There are workarounds and mitigations that address this vulnerability. To remove the attack vector for this vulnerability, either of the following two options can be used. Only one of the two options needs to be applied. Revert to Snort 2 Disable TLS 1.3 Decryption Reverting to Snort 2 Before downgrading, review the Before you Begin section in the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Note: Downgrading to Snort 2 will delete customer policies, NAP customizations, and Hostname redirect in active authentications. To discuss the effects of reverting on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"]. Reverting to Snort 2 for Cisco FTD devices managed by FDM Software To revert to Snort 2 on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Device. In the Updates area, choose View Configuration. In the Intrusion Rule section, choose Downgrade to 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about reverting to Snort 2, see the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Reverting to Snort 2 for Cisco FTD devices managed by FMC Software To revert to Snort 2 on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Devices menu, choose Device Management. Choose the appropriate Cisco FTD device. Click the Edit pencil icon. Choose the Device tab. In the Inspection Engine area, choose Revert to Snort 2. After making the changes above, deploy changes to your FTD devices. For detailed information about reverting to Snort 2, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. Reverting to Snort 2 for Cisco FTD devices managed by Cisco Defense Orchestrator To revert to Snort 2 on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. In the navigation bar, click Inventory. Click the Devices tab. Click the FTD tab and click the device you want to revert. In the Device Actions pane located to the right, click Upgrade. Set the upgrade toggle to Intrusion Prevention Engine. Click Revert to Snort Engine 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about Cisco Defense Orchestrator managed devices, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about reverting to Snort 2 for Cisco FMC Devices managed with Cisco Defense Orchestrator, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. For detailed information about reverting to Snort 2 for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the Revert From Snort 3.0 for FDM-Managed Device ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/onboard-devices-and-services.html?bookSearch=true#Revert_From_Snort_3_for_FTD"] section of the Managing FDM Devices with Cisco Defense Orchestrator guide. Disabling TLS 1.3 Decryption This mitigation can affect your client and server connections. When TLS 1.3 decryption is disabled, the TLS connection downgrades to TLS 1.2 while matching the decryption rule. The effects on the deployment will depend on the clients and servers that will connect through the Cisco FTD device. To discuss the effects this will have on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"] . Disabling TLS 1.3 for Cisco FTD Software devices managed by FDM Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Policies. Choose the SSL Decryption tab. Click the SSL Decryption Settings button. Click on the Advanced tab. Disable the TLS 1.3 Decryption setting. Click OK. After changing the policy above, deploy the new policy to your Cisco FTD devices. For detailed information about TLS 1.3 decryption, see the Configure Advanced and Undecryptable Traffic Settings ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-ssl-decryption.html#Cisco_Task_in_List_GUI.dita_5d1e9ebe-75f2-4849-a2e8-54cf31e95c06"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Disabling TLS 1.3 for Cisco FTD Software devices managed by FMC Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Policies menu, choose SSL. Choose the appropriate SSL Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Uncheck the Enable TLS 1.3 Decryption box. Click Save to save your changes. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about TLS 1.3 decryption, see the SSL Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/device-config/720/management-center-device-config-72/encrypted-traffic-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section in the Cisco Secure Firewall Management Center Configuration Guide. Disabling TLS 1.3 for Cisco FTD Software devices managed by Cisco Defense Orchestrator To disable TLS 1.3 Decryption on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. From the Cisco Defense Orchestrator Policies menu, choose FTD Policies. From the FTD Policies menu, choose Decryption. Choose the appropriate Decryption Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Disable Enable TLS 1.3 Decryption. Click Save. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about devices managed by Cisco Defense Orchestrator, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about TLS 1.3 decryption, see the Decryption Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/cdo/cloud-delivered-firewall-management-center-in-cdo/managing-firewall-threat-defense-services-with-cisco-defense-orchestrator/m_decryption-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section of Managing Firewall Threat Defense with Cloud-Delivered Firewall Management Center in Cisco Defense Orchestrator. For detailed information about TLS 1.3 decryption for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the SSL Decryption Policy ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/configuring-ftd-devices.html#FTD_SSL_Decryption_Policy"] section of Managing FDM Devices with Cisco Defense Orchestrator. While these workarounds and mitigations have been deployed and were proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.
WorkaroundCisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1 when installed on Cisco Secure Firewall 3100 Seriescisco_csaf
There are workarounds and mitigations that address this vulnerability. To remove the attack vector for this vulnerability, either of the following two options can be used. Only one of the two options needs to be applied. Revert to Snort 2 Disable TLS 1.3 Decryption Reverting to Snort 2 Before downgrading, review the Before you Begin section in the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Note: Downgrading to Snort 2 will delete customer policies, NAP customizations, and Hostname redirect in active authentications. To discuss the effects of reverting on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"]. Reverting to Snort 2 for Cisco FTD devices managed by FDM Software To revert to Snort 2 on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Device. In the Updates area, choose View Configuration. In the Intrusion Rule section, choose Downgrade to 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about reverting to Snort 2, see the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Reverting to Snort 2 for Cisco FTD devices managed by FMC Software To revert to Snort 2 on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Devices menu, choose Device Management. Choose the appropriate Cisco FTD device. Click the Edit pencil icon. Choose the Device tab. In the Inspection Engine area, choose Revert to Snort 2. After making the changes above, deploy changes to your FTD devices. For detailed information about reverting to Snort 2, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. Reverting to Snort 2 for Cisco FTD devices managed by Cisco Defense Orchestrator To revert to Snort 2 on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. In the navigation bar, click Inventory. Click the Devices tab. Click the FTD tab and click the device you want to revert. In the Device Actions pane located to the right, click Upgrade. Set the upgrade toggle to Intrusion Prevention Engine. Click Revert to Snort Engine 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about Cisco Defense Orchestrator managed devices, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about reverting to Snort 2 for Cisco FMC Devices managed with Cisco Defense Orchestrator, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. For detailed information about reverting to Snort 2 for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the Revert From Snort 3.0 for FDM-Managed Device ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/onboard-devices-and-services.html?bookSearch=true#Revert_From_Snort_3_for_FTD"] section of the Managing FDM Devices with Cisco Defense Orchestrator guide. Disabling TLS 1.3 Decryption This mitigation can affect your client and server connections. When TLS 1.3 decryption is disabled, the TLS connection downgrades to TLS 1.2 while matching the decryption rule. The effects on the deployment will depend on the clients and servers that will connect through the Cisco FTD device. To discuss the effects this will have on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"] . Disabling TLS 1.3 for Cisco FTD Software devices managed by FDM Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Policies. Choose the SSL Decryption tab. Click the SSL Decryption Settings button. Click on the Advanced tab. Disable the TLS 1.3 Decryption setting. Click OK. After changing the policy above, deploy the new policy to your Cisco FTD devices. For detailed information about TLS 1.3 decryption, see the Configure Advanced and Undecryptable Traffic Settings ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-ssl-decryption.html#Cisco_Task_in_List_GUI.dita_5d1e9ebe-75f2-4849-a2e8-54cf31e95c06"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Disabling TLS 1.3 for Cisco FTD Software devices managed by FMC Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Policies menu, choose SSL. Choose the appropriate SSL Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Uncheck the Enable TLS 1.3 Decryption box. Click Save to save your changes. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about TLS 1.3 decryption, see the SSL Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/device-config/720/management-center-device-config-72/encrypted-traffic-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section in the Cisco Secure Firewall Management Center Configuration Guide. Disabling TLS 1.3 for Cisco FTD Software devices managed by Cisco Defense Orchestrator To disable TLS 1.3 Decryption on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. From the Cisco Defense Orchestrator Policies menu, choose FTD Policies. From the FTD Policies menu, choose Decryption. Choose the appropriate Decryption Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Disable Enable TLS 1.3 Decryption. Click Save. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about devices managed by Cisco Defense Orchestrator, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about TLS 1.3 decryption, see the Decryption Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/cdo/cloud-delivered-firewall-management-center-in-cdo/managing-firewall-threat-defense-services-with-cisco-defense-orchestrator/m_decryption-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section of Managing Firewall Threat Defense with Cloud-Delivered Firewall Management Center in Cisco Defense Orchestrator. For detailed information about TLS 1.3 decryption for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the SSL Decryption Policy ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/configuring-ftd-devices.html#FTD_SSL_Decryption_Policy"] section of Managing FDM Devices with Cisco Defense Orchestrator. While these workarounds and mitigations have been deployed and were proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.
WorkaroundCisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1 when installed on Cisco Secure Firewall Threat Defense Virtualcisco_csaf
There are workarounds and mitigations that address this vulnerability. To remove the attack vector for this vulnerability, either of the following two options can be used. Only one of the two options needs to be applied. Revert to Snort 2 Disable TLS 1.3 Decryption Reverting to Snort 2 Before downgrading, review the Before you Begin section in the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Note: Downgrading to Snort 2 will delete customer policies, NAP customizations, and Hostname redirect in active authentications. To discuss the effects of reverting on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"]. Reverting to Snort 2 for Cisco FTD devices managed by FDM Software To revert to Snort 2 on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Device. In the Updates area, choose View Configuration. In the Intrusion Rule section, choose Downgrade to 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about reverting to Snort 2, see the Switching Between Snort 2 and Snort 3 ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-intrusion.html?bookSearch=true#id_120089"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Reverting to Snort 2 for Cisco FTD devices managed by FMC Software To revert to Snort 2 on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Devices menu, choose Device Management. Choose the appropriate Cisco FTD device. Click the Edit pencil icon. Choose the Device tab. In the Inspection Engine area, choose Revert to Snort 2. After making the changes above, deploy changes to your FTD devices. For detailed information about reverting to Snort 2, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. Reverting to Snort 2 for Cisco FTD devices managed by Cisco Defense Orchestrator To revert to Snort 2 on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. In the navigation bar, click Inventory. Click the Devices tab. Click the FTD tab and click the device you want to revert. In the Device Actions pane located to the right, click Upgrade. Set the upgrade toggle to Intrusion Prevention Engine. Click Revert to Snort Engine 2.0. After making the changes above, deploy changes to your Cisco FTD devices. For detailed information about Cisco Defense Orchestrator managed devices, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about reverting to Snort 2 for Cisco FMC Devices managed with Cisco Defense Orchestrator, see the Snort 3 Inspection Engine ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72/migrating.html#concept_D87B73A83ACA42CCA656F0041F9D860B-enabledisable"] chapter of the Cisco Secure Firewall Management Center Snort 3 Configuration Guide. For detailed information about reverting to Snort 2 for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the Revert From Snort 3.0 for FDM-Managed Device ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/onboard-devices-and-services.html?bookSearch=true#Revert_From_Snort_3_for_FTD"] section of the Managing FDM Devices with Cisco Defense Orchestrator guide. Disabling TLS 1.3 Decryption This mitigation can affect your client and server connections. When TLS 1.3 decryption is disabled, the TLS connection downgrades to TLS 1.2 while matching the decryption rule. The effects on the deployment will depend on the clients and servers that will connect through the Cisco FTD device. To discuss the effects this will have on your deployment, contact the Technical Assistance Center (TAC) ["https://www.cisco.com/go/tac/"] . Disabling TLS 1.3 for Cisco FTD Software devices managed by FDM Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FDM Software, complete the following steps: Log in to the Cisco FTD Software web interface. From the main menu, choose Policies. Choose the SSL Decryption tab. Click the SSL Decryption Settings button. Click on the Advanced tab. Disable the TLS 1.3 Decryption setting. Click OK. After changing the policy above, deploy the new policy to your Cisco FTD devices. For detailed information about TLS 1.3 decryption, see the Configure Advanced and Undecryptable Traffic Settings ["https://www.cisco.com/c/en/us/td/docs/security/firepower/730/fdm/fptd-fdm-config-guide-730/fptd-fdm-ssl-decryption.html#Cisco_Task_in_List_GUI.dita_5d1e9ebe-75f2-4849-a2e8-54cf31e95c06"] section in the Cisco Firepower Threat Defense Configuration Guide for Firepower Device Manager. Disabling TLS 1.3 for Cisco FTD Software devices managed by FMC Software To disable TLS 1.3 Decryption on a device that is managed by Cisco FMC Software, complete the following steps: Log in to the Cisco FMC Software web interface. From the Policies menu, choose SSL. Choose the appropriate SSL Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Uncheck the Enable TLS 1.3 Decryption box. Click Save to save your changes. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about TLS 1.3 decryption, see the SSL Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/device-config/720/management-center-device-config-72/encrypted-traffic-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section in the Cisco Secure Firewall Management Center Configuration Guide. Disabling TLS 1.3 for Cisco FTD Software devices managed by Cisco Defense Orchestrator To disable TLS 1.3 Decryption on a device that is managed by Cisco Defense Orchestrator, complete the following steps: Log in to the Cisco Defense Orchestrator web interface. From the Cisco Defense Orchestrator Policies menu, choose FTD Policies. From the FTD Policies menu, choose Decryption. Choose the appropriate Decryption Policy. Click the Edit pencil icon. Click the Advanced Settings tab. Disable Enable TLS 1.3 Decryption. Click Save. After changing the policy above, deploy the new policy to your FTD devices. For detailed information about devices managed by Cisco Defense Orchestrator, see the Cisco Defense Orchestrator documentation. ["https://docs.defenseorchestrator.com/#!g-managing-security-and-network-devices-with-cdo.html"] For detailed information about TLS 1.3 decryption, see the Decryption Policy Advanced Options ["https://www.cisco.com/c/en/us/td/docs/security/cdo/cloud-delivered-firewall-management-center-in-cdo/managing-firewall-threat-defense-services-with-cisco-defense-orchestrator/m_decryption-policies.html#Cisco_Reference.dita_9fb8dc41-d845-4470-8c77-2ce3910180b8"] section of Managing Firewall Threat Defense with Cloud-Delivered Firewall Management Center in Cisco Defense Orchestrator. For detailed information about TLS 1.3 decryption for Cisco FDM Devices managed with Cisco Defense Orchestrator, see the SSL Decryption Policy ["https://www.cisco.com/c/en/us/td/docs/security/cdo/managing-ftd-with-cdo/managing-ftd-with-cisco-defense-orchestrator/configuring-ftd-devices.html#FTD_SSL_Decryption_Policy"] section of Managing FDM Devices with Cisco Defense Orchestrator. While these workarounds and mitigations have been deployed and were proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.

cvss

Technical severity, 0–10. One row per scoring source.

4.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.7–4

v3.14mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:Lprimary · NVD / NIST USexploitability 2.2 · impact 1.4

v3.14mediumAV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:Lsecondary · FSTEC (BDU) RU

v3.14mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:Lsecondary · ENISA EU

v3.14mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:Lsecondary · psirt@cisco.com USexploitability 2.2 · impact 1.4

v3.13.7lowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L/E:Usecondary · CVSS-BT (t0sche)

v3.14mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:Lsecondary · Cisco PSIRT US

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-244USCWE-404USCWE-840US

affected products (22)

Products and version ranges known to be affected.

showing 20 of 22

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-2809Cisco Firepower Threat Defense Software und Management Center: Mehrere SchwachstellenDeutsch2023-11-01csaf · cert_bundDE
Ein entfernter Angreifer kann mehrere Schwachstellen in Cisco Firepower Threat Defense Software und Management Center ausnutzen, um Sicherheitsmaßnahmen zu umgehen, beliebigen Code auszuführen oder einen Denial-of-Service-Zustand zu verursachen.
cisco-sa-ftd-snort3-uAnUntcVCisco Firepower Threat Defense Software Snort 3 Detection Engine Denial of Service Vulnerability2023-11-01csaf · cisco_csafUS
A vulnerability in the TLS 1.3 implementation of the Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 detection engine to unexpectedly restart. This vulnerability is due to a logic error in how memory allocations are handled during a TLS 1.3 session. Under specific, time-based constraints, an attacker could exploit this vulnerability by sending a crafted TLS 1.3 message sequence through an affected device. A successful exploit could allow the attacker to cause the Snort 3 detection engine to reload, resulting in a denial of service (DoS) condition. While the Snort detection engine reloads, packets going through the FTD device that are sent to the Snort detection engine will be dropped. The Snort detection engine will restart automatically. No manual intervention is required. Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability. This advisory is part of the November 2023 release of the Cisco ASA, FTD, and FMC Security Advisory Bundled publication. For a complete list of the advisories and links to them, see Cisco Event Response: November 2023 Semiannual Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication ["https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74985"].

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund cisco_csaf NVD CVE.org MITRE

published 2023-11-01modified 2026-08-11

references (4)

External citations — patches, advisories, analysis.

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