Improper access control in Cisco Secure Firewall Threat Defense (FTD) and Cisco Secure Firewall Adaptive Security Appliance (ASA) - CVE-2026-20073
Published: March 9, 2026
Vulnerability identifier: #VU123652
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N]
CVE-ID: CVE-2026-20073
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to improper error handling when an affected device that is joining a cluster runs out of memory while replicating access control rules. A remote attacker can bypass implemented access controls and reach devices in protected networks.
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-2026-20073
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, 9.18.4.71, 9.20.4.14, 9.22.2.14, 9.23.1.22, 9.24.1
Cisco Secure Firewall Adaptive Security Appliance (ASA) - addressed in versions 9.16.4.85, 9.18.4.71, 9.20.4.14, 9.22.2.14, 9.23.1.22, 9.24.1