CVE-2024-20526

mediumpriority · track · 21EPSS 0.005 · 42 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.49% (42nd) EPSS

CVSS 5.3 · medium

Is it mine?

36 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 SSH server of Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition for the SSH server of an affected device. This vulnerability is due to a logic error when an SSH session is established. An attacker could exploit this vulnerability by sending crafted SSH messages to an affected device. A successful exploit could allow the attacker to exhaust available SSH resources on the affected device so that new SSH connections to the device are denied, resulting in a DoS condition. Existing SSH connections to the device would continue to function normally. The device must be rebooted manually to recover. However, user traffic would not be impacted and could be managed using a remote application such as Cisco Adaptive Security Device Manager (ASDM).

remediations

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

A vendor fix is available.

FixedCisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.67 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 Adaptive Security Appliance (ASA) Software 9.16.4.67 when installed on Cisco ASA 5500-X Series Firewallscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.67 when installed on Cisco Adaptive Security Virtual Appliance (ASAv)cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.67 when installed on Cisco Firepower 1000 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.67 when installed on Cisco Firepower 2100 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.67 when installed on Cisco Firepower 4100 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.67 when installed on Cisco Firepower 9000 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.70 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 Adaptive Security Appliance (ASA) Software 9.18.4.40 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 Adaptive Security Appliance (ASA) Software 9.18.4.40 when installed on Cisco Adaptive Security Virtual Appliance (ASAv)cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.40 when installed on Cisco Firepower 1000 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.40 when installed on Cisco Firepower 2100 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.40 when installed on Cisco Firepower 4100 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.40 when installed on Cisco Firepower 9000 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.40 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 Adaptive Security Appliance (ASA) Software 9.20.3 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 Adaptive Security Appliance (ASA) Software 9.20.3 when installed on Cisco Adaptive Security Virtual Appliance (ASAv)cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3 when installed on Cisco Firepower 1000 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3 when installed on Cisco Firepower 2100 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3 when installed on Cisco Firepower 4100 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3 when installed on Cisco Firepower 9000 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3 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 Adaptive Security Appliance (ASA) Software 9.20.3 when installed on Cisco Secure Firewall 4200 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
WorkaroundCisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.67 when installed on Cisco 3000 Series Industrial Security Appliances (ISA)cisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.16.4.67 when installed on Cisco ASA 5500-X Series Firewallscisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.16.4.67 when installed on Cisco Adaptive Security Virtual Appliance (ASAv)cisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.16.4.67 when installed on Cisco Firepower 1000 Seriescisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.16.4.67 when installed on Cisco Firepower 2100 Seriescisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.16.4.67 when installed on Cisco Firepower 4100 Seriescisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.16.4.67 when installed on Cisco Firepower 9000 Seriescisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.16.4.70 when installed on Cisco 3000 Series Industrial Security Appliances (ISA)cisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.18.4.40 when installed on Cisco 3000 Series Industrial Security Appliances (ISA)cisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.18.4.40 when installed on Cisco Adaptive Security Virtual Appliance (ASAv)cisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.18.4.40 when installed on Cisco Firepower 1000 Seriescisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.18.4.40 when installed on Cisco Firepower 2100 Seriescisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.18.4.40 when installed on Cisco Firepower 4100 Seriescisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.18.4.40 when installed on Cisco Firepower 9000 Seriescisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.18.4.40 when installed on Cisco Secure Firewall 3100 Seriescisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.20.3 when installed on Cisco 3000 Series Industrial Security Appliances (ISA)cisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.20.3 when installed on Cisco Adaptive Security Virtual Appliance (ASAv)cisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.20.3 when installed on Cisco Firepower 1000 Seriescisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.20.3 when installed on Cisco Firepower 2100 Seriescisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.20.3 when installed on Cisco Firepower 4100 Seriescisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.20.3 when installed on Cisco Firepower 9000 Seriescisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.20.3 when installed on Cisco Secure Firewall 3100 Seriescisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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 Adaptive Security Appliance (ASA) Software 9.20.3 when installed on Cisco Secure Firewall 4200 Seriescisco_csaf
There is no workaround for this vulnerability for devices that are running Cisco ASA Software Release 9.16.4.67 or 9.16.4.70. For devices that are running Cisco ASA Software Release 9.18.4.40 or 9.20.3, use the ssh stack ciscossh CLI command to configure the device to use the CiscoSSH stack, which is not affected by this vulnerability. For more information about implementing this command, see the ssh stack ciscossh ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/S/asa-command-ref-S/so-st-commands.html#wp8411317820"] section of Cisco Secure Firewall ASA Series Command Reference. While this workaround has been deployed and was 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.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.15.3mediumAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · FSTEC (BDU) RU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · ENISA EU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · psirt@cisco.com USexploitability 3.9 · impact 1.4

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:Usecondary · CVSS-BT (t0sche)

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · Cisco PSIRT US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-770USprimaryCWE-400USCWE-400US

affected products (36)

Products and version ranges known to be affected.

showing 20 of 36

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2024-3261Cisco ASA (Adaptive Security Appliance): Mehrere SchwachstellenDeutsch2024-10-23csaf · cert_bundDE
Ein entfernter, authentisierter oder anonymer Angreifer kann mehrere Schwachstellen in Cisco ASA (Adaptive Security Appliance) ausnutzen, um beliebigen Programmcode mit Administratorrechten auszuführen und einen Denial-of-Service-Zustand zu erzeugen.
cisco-sa-asa-ssh-dos-eEDWu5RMCisco Adaptive Security Appliance Software SSH Server Resource Denial of Service Vulnerability2024-10-23csaf · cisco_csafUS
A vulnerability in the SSH server of Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition for the SSH server of an affected device. This vulnerability is due to a logic error when an SSH session is established. An attacker could exploit this vulnerability by sending crafted SSH messages to an affected device. A successful exploit could allow the attacker to exhaust available SSH resources on the affected device so that new SSH connections to the device are denied, resulting in a DoS condition. Existing SSH connections to the device would continue to function normally. The device must be rebooted manually to recover. However, user traffic would not be impacted and could be managed using a remote application such as Cisco Adaptive Security Device Manager (ASDM). Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability. This advisory is part of the October 2024 release of the Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: October 2024 Semiannual Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication ["https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75300"].

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 2024-10-23modified 2026-06-17

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references (4)

External citations — patches, advisories, analysis.

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