CVE-2026-20329 Other in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
Cisco firewall software contains improper exception handling flaws that could lead to denial of service, requiring a security patch.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20329?
CVE-2026-20329 is a critical vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, published on 16 Sep 2026. Any signed-in user can exploit it over the 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-2026-20329 are related to issues concerning improper handling of exceptional conditions that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-703.
Weakness: CWE-703
Which versions are affected by CVE-2026-20329?
How do I fix CVE-2026-20329?
No fix has been published for CVE-2026-20329 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20329 being exploited?
There is no known exploitation of CVE-2026-20329 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-p9gc-crmq-wcr6.