CVE-2019-1669

mediumpriority · track · 34EPSS 0.012 · 69 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.25% (69th) EPSS

CVSS 5 · medium

Is it mine?

5 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-28

A vulnerability in the data acquisition (DAQ) component of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured access control policies or cause a denial of service (DoS) condition. The vulnerability exists because the affected software improperly manages system memory resources when inspecting traffic. An attacker could exploit this vulnerability by generating specific traffic patterns for the software to inspect. A successful exploit could allow the attacker to exhaust system memory resources used for traffic inspection. Depending on the configuration, the FTD Software could fail open and cease to inspect traffic or fail closed and result in a DoS condition. This vulnerability may require manual intervention to restore the software.

remediations

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

A vendor fix is available.

Fixed6.3.0cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Workaround6.3.0cisco_csaf
Disabling SSL hardware acceleration, which is enabled by default in FTD Software Release 6.3.0, mitigates this vulnerability when no SSL policy is applied. Configurations with SSL policies enabled are not vulnerable. Administrators can issue the system support ssl-hw-offload disable command in the CLI to disable SSL hardware acceleration. This command will reboot the device. ftd# system support ssl-hw-offload disable

cvss

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

8.6

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–8.6

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.08.6highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 4

v3.08.6highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:Nsecondary · ENISA EU

v3.08.6highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:Nsecondary · Cisco PSIRT US

v3.08.6highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:Nsecondary · psirt@cisco.com USexploitability 3.9 · impact 4

v3.07.9highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.18.6highAV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:Nsecondary · FSTEC (BDU) RU

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-693USprimaryCWE-693US

affected products (5)

Products and version ranges known to be affected.

Cisco 6.3.0all versionscisco_csafUS
Cisco Cisco Firepower Threat Defense Software≤ n/aenisa_euvdEU
Cisco Systems Inc. Firepower Threat Defense≤ 6.3.0fstec_bduRU
cisco secure firewall threat defense= 6.3.0nvdUScpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*
cisco secure firewall threat defense= 6.4.0nvdUScpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

cisco-sa-20190123-firepowertds-bypassCisco Firepower Threat Defense Software Packet Inspection and Enforcement Bypass Vulnerability2019-01-23csaf · cisco_csafUS
A vulnerability in the data acquisition (DAQ) component of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured access control policies or cause a denial of service (DoS) condition. The vulnerability exists because the affected software improperly manages system memory resources when inspecting traffic. An attacker could exploit this vulnerability by generating specific traffic patterns for the software to inspect. A successful exploit could allow the attacker to exhaust system memory resources used for traffic inspection. Depending on the configuration, the FTD Software could fail open and cease to inspect traffic or fail closed and result in a DoS condition. This vulnerability may require manual intervention to restore the software. Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisco_csaf nvd NVD CVE.org MITRE

published 2019-01-24modified 2026-08-11

related (1,066)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2026-58704US	—OT critical	0.63% (50th)	KEV	2026-09-15
In Cellular Modem, there is a possible permission bypass due to a logic error in the code. This could lead to remote (proximal/adjacent) escalation of privilege with no additional…
CVE-2026-32202US	—OT critical	70.9% (99th)	KEV	2026-04-14
Protection mechanism failure in Windows Shell allows an unauthorized attacker to perform spoofing over a network.
CVE-2026-21513US	—OT critical	15.9% (97th)	KEV	2026-02-10
Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.
CVE-2026-21510US	—OT critical	61.2% (99th)	KEV	2026-02-10
Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.
CVE-2025-40536US	critical9.8OT critical	73.6% (99th)	KEV	2026-01-28
SolarWinds Web Help Desk was found to be susceptible to a security control bypass vulnerability that if exploited, could allow an unauthenticated attacker to gain access to certain…

+1061 more

references (7)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan