Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Object Group Access Control List Bypass Vulnerabilities

Description

Multiple vulnerabilities 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. These vulnerabilities are due to a logic error in populating group access control policies (ACPs) with OGS configured. An attacker could exploit these vulnerabilities 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. Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-acl-bypass-8p6vFvw This advisory is part of a group of advisories. For a complete list of the advisories and links to them, see Cisco Advance Notification for Publication of September 16, 2026, Security Advisories . In addition, for further documentation of improvements and fixes in Cisco Secure Firewall products, see Cisco Secure Firewall Adaptive Security Appliance Software, Secure Firewall Threat Defense Software, and Secure Firewall Management Center Software Hardening Release: September 2026 . Security Impact Rating: Medium CVE: CVE-2026-20120,CVE-2026-20121

What to do

Install the fixed versions listed in the official advisory. If you cannot update right away, apply the workarounds or mitigations it describes and limit access to the affected service.

Details

Vendor

Cisco

Product

Cisco ASA / FTD

CVE

CVE-2026-20120, CVE-2026-20121

Affected versions

Cisco Secure Firewall Adaptive Security Appliance (ASA) Soft 9.23: 6 versions, from 9.23.1 to 9.23.1.22
Cisco Secure Firewall Adaptive Security Appliance (ASA) Soft 9.22: 10 versions, from 9.22.1.1 to 9.22.2.20
Cisco Secure Firewall Threat Defense (FTD) Software 7.6: 4 versions, from 7.6.0 to 7.6.2.1
Cisco Secure Firewall Threat Defense (FTD) Software 7.7: 4 versions, from 7.7.0 to 7.7.11 (from the advisory and NVD; check the exact builds in the official advisory)

CVSS score

5.8

Actively exploited

Not known at this time

Source

Cisco PSIRT – original advisory

Published

September 18, 2026

The description and the recommended action are quoted from the public advisory (the action is our generic advice); severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.