CVE-2026-20121 CIsco FTD Bypass Access List
Unauthenticated remote attackers can bypass access controls to reach protected networks due to a logic error in ACL Object Group Search implementation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20121?
CVE-2026-20121 is a medium-severity authentication bypass vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the access control list (ACL) Object Group Search (OGS) implementation of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured access controls. This vulnerability is due to a logic error in populating group access control policies (ACPs) with OGS configured. An attacker could exploit this vulnerability by sending traffic that should be blocked through the device. A successful exploit could allow the attacker to bypass access controls and reach devices in protected networks.
Weakness: CWE-284
Which versions are affected by CVE-2026-20121?
How do I fix CVE-2026-20121?
No fix has been published for CVE-2026-20121 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-20121 being exploited?
There is no known exploitation of CVE-2026-20121 in the wild and no public exploit code.
Sources
Also known as GHSA-9j5c-2gxv-8m6x.