OS Command Injection in Cisco Secure Firewall Threat Defense (FTD) and Cisco Secure Firewall Adaptive Security Appliance (ASA) - CVE-2026-20008
Published: March 6, 2026 / Updated: March 9, 2026
Vulnerability identifier: #VU123618
CSH Severity: Low
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20008
CWE-ID: CWE-78
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to improper input validation. A local privileged user can submit a specially crafting valid Lua code as a malicious parameter for a CLI command and execute arbitrary OS commands as root.
Affected software
Cisco Secure Firewall Threat Defense (FTD)
Cisco Secure Firewall Adaptive Security Appliance (ASA)
Cisco Secure Firewall Adaptive Security Appliance (ASA)
How to mitigate CVE-2026-20008
Install updates from vendor's website.
Cisco Secure Firewall Threat Defense (FTD) - addressed in versions 7.0.9, 7.2.11, 7.4.4, 7.6.4, 7.7.11
Cisco Secure Firewall Adaptive Security Appliance (ASA) - addressed in versions 9.16.4.85, 9.18.4.66, 9.20.4, 9.22.2.4, 9.23.1.7, 9.24.1
Cisco Secure Firewall Adaptive Security Appliance (ASA) - addressed in versions 9.16.4.85, 9.18.4.66, 9.20.4, 9.22.2.4, 9.23.1.7, 9.24.1