CVE-2026-20331 Security feature bypass in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
Cisco firewall software contains protection mechanism failures that allow bypassing security controls, requiring a hardening patch.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20331?
CVE-2026-20331 is a critical vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, published on 16 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Adaptive Security Appliance Software, Cisco Secure Firewall Threat Defense Software and Cisco Secure Firewall Management Center Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20331 are related to the failure of protection mechanisms issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-693.
Weakness: CWE-693
Which versions are affected by CVE-2026-20331?
How do I fix CVE-2026-20331?
No fix has been published for CVE-2026-20331 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20331 being exploited?
There is no known exploitation of CVE-2026-20331 in the wild and no public exploit code.
Sources
Also known as GHSA-rxhv-qf6p-6qjj.