CVE-2026-20120: Improper Access Control
Source GCVE Database
Not known to be exploited · CVSS 5.8 Medium.
Data as of 31 Oct 2026, 20:20 UTC
- EPSS
- 0.5% chance of exploitation in 30 days – higher than 43% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 16 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 31 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| CiscoCisco Secure Firewall Adaptive Security Appliance (ASA) Software | Affected
| Fixed in– |
| CiscoCisco Secure Firewall Threat Defense (FTD) Software | Affected
| Fixed in– |
AI-suggested
Until a patch is available, monitor vendor advisories for updates and consider temporary mitigations if recommended by Cisco.
Description
A logic error in the access control list (ACL) Object Group Search (OGS) implementation of Cisco Secure Firewall ASA and FTD software allows an unauthenticated remote attacker to bypass configured access controls. This vulnerability enables the attacker to send traffic that should be blocked through the firewall, potentially reaching protected network devices. The issue arises from improper population of group access control policies when OGS is configured.