What’s Vulnerable › Vulnerabilities

CVE-2019-1669: Cisco Firepower Threat Defense Software Packet Inspection and Enforcement Bypass Vulnerability

• Severity: high (CVSS 8.6 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-01-24 · updated 2026-08-11
• Weakness: CWE-693

Description

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.

Affected products

• Cisco Firepower Threat Defense Software: 6.3.0, 6.4.0

References

• http://www.securityfocus.com/bid/106721
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190123-firepowertds-bypass
• http://www.securityfocus.com/bid/106721
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190123-firepowertds-bypass

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