Medium [CVE-2026-20120 +1] Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Object Group Access Control List Bypass Vulnerabilities
This medium-severity Cisco advisory covers CVE-2026-20120 and CVE-2026-20121 affecting Secure Firewall Threat Defense (FTD) Software, Firepower 1000 Series, 3000 Series Industrial Security Appliances (ISA).
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations. This bulletin covers 2 CVEs; its score, affected versions and guidance may apply to different issues within that bulletin.
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Summary
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 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.
- Scope: At the time of publication, these vulnerabilities affected Cisco devices if they were running a vulnerable release of Cisco Secure Firewall ASA Software or Cisco Secure FTD Software and had ACLs with OGS configured.
- Release N/A (first fixed: 9.20 and earlier / 9.22)
- Release 9.22.3.26 (first fixed: 9.22.3.191 / 9.23.1.195)
- Release 9.23.1.47 (first fixed: 9.23.1.211 / 9.24.1.155)
- Release 7.6 (first fixed: 7.6.6)
- Release 7.7 (first fixed: 7.7.13)
- Release 10.0 (first fixed: 10.0.2)
- Release 10.1 (first fixed: 10.1.0)
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
- 9.20 and earlier / 9.22
- 9.22.3.191 / 9.23.1.195
- 9.23.1.211 / 9.24.1.155
- 7.6.6
- 7.7.13
- 10.0.2
- 10.1.0
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Mitigation checklist
- Upgrade to the first fixed release for your train per the Fixed Releases table in this advisory.
- Release N/A: upgrade to 9.20 and earlier / 9.22.
- Release 9.22.3.26: upgrade to 9.22.3.191 / 9.23.1.195.
- Release 9.23.1.47: upgrade to 9.23.1.211 / 9.24.1.155.
- Release 7.6: upgrade to 7.6.6.
- Release 7.7: upgrade to 7.7.13.
- Release 10.0: upgrade to 10.0.2.
- Release 10.1: upgrade to 10.1.0.
- There are no workarounds that address these vulnerabilities.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
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