Answer in brief
CVE-2026-20331 records a Unknown severity vulnerability in Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software and Secure Firewall Management Center Software Hardening Release - Protection Mechanism Failure Vulnerabilities. The current sources do not mark it as known exploited. The current feed maps Cisco/Cisco Secure Firewall Adaptive Security Appliance (ASA) Software (generic), Cisco/Cisco Secure Firewall Management Center (FMC) (generic), Cisco/Cisco Secure Firewall Threat Defense (FTD) Software (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Cisco/Cisco Secure Firewall Adaptive Security Appliance (ASA) Software (generic), Cisco/Cisco Secure Firewall Management Center (FMC) (generic), Cisco/Cisco Secure Firewall Threat Defense (FTD) Software (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Cisco/Cisco Secure Firewall Adaptive Security Appliance (ASA) Softwaregeneric | 9.16.1 || 9.16.1.28 || 9.16.2 || 9.16.2.3 || 9.16.2.7 || 9.16.2.11 || 9.16.2.13 || 9.16.2.14 || 9.16.3.3 || 9.16.3 || 9.16.3.14 || 9.16.3.15 || 9.18.1.3 || 9.18.2 || 9.16.3.19 || 9.16.3.23 || 9.18.2.5 || 9.16.4 || 9.18.2.7 || 9.16.4.9 || 9.18.2.8 || 9.16.4.14 || 9.18.3 || 9.16.4.18 || 9.18.3.39 || 9.16.4.19 || 9.18.3.46 || 9.16.4.27 || 9.18.3.53 || 9.18.3.55 || 9.16.4.38 || 9.16.4.39 || 9.18.3.56 || 9.20.1 || 9.16.4.42 || 9.18.4 || 9.20.1.5 || 9.18.4.5 || 9.16.4.48 || 9.18.4.8 || 9.20.2 || 9.16.4.55 || 9.18.4.22 || 9.20.2.10 || 9.16.4.57 || 9.18.4.24 || 9.20.2.21 || 9.16.4.61 || 9.18.4.29 || 9.20.2.22 || 9.16.4.62 || 9.18.4.34 || 9.20.3 || 9.16.4.67 || 9.16.4.70 || 9.18.4.40 || 9.23.1 || 9.22.1.1 || 9.16.4.71 || 9.20.3.4 || 9.18.4.47 || 9.20.3.7 || 9.16.4.76 || 9.20.3.9 || 9.18.4.50 || 9.22.1.3 || 9.20.3.10 || 9.22.1.2 || 9.18.4.52 || 9.20.3.13 || 9.22.1.6 || 9.18.4.53 || 9.16.4.82 || 9.22.2 || 9.20.3.16 || 9.19.1.42 || 9.18.4.57 || 9.16.4.84 || 9.23.1.3 || 9.20.3.20 || 9.22.2.4 || 9.23.1.7 || 9.20.4 || 9.22.2.9 || 9.23.1.13 || 9.20.4.7 || 9.22.2.13 || 9.18.4.66 || 9.20.4.10 || 9.23.1.19 || 9.16.4.85 || 9.22.2.14 || 9.18.4.67 || 9.24.1 || 9.18.4.68 || 9.23.1.22 || 9.20.4.14 || 9.22.2.20 || 9.18.4.71 || 9.20.4.19 || 9.23.1.26 || 9.16.4.89 || 9.22.2.32 || 9.18.4.76 || 9.22.3 || 9.24.1.5 || 9.20.4.22 || 9.24.1.9 || 9.20.4.28 || 9.22.3.5 || 9.16.4.92 || 9.18.4.135 || 9.23.1.195 || 9.20.4.30 || 9.24.1.155 || 9.23.1.32 || 9.24.1.11 || 9.20.4.34 || 9.18.4.82 || 9.24.10 || 9.23.1.211 || 9.20.4.235 || 9.24.1.221 || 9.22.3.191 | Not reported |
| Cisco/Cisco Secure Firewall Management Center (FMC)generic | 7.0.0 || 7.0.0.1 || 7.0.1 || 7.0.1.1 || 7.0.2 || 7.2.0 || 7.0.2.1 || 7.0.3 || 7.2.0.1 || 7.0.4 || 7.2.1 || 7.0.5 || 7.3.0 || 7.2.2 || 7.3.1 || 7.2.3 || 7.2.3.1 || 7.2.4 || 7.0.6 || 7.2.4.1 || 7.2.5 || 7.3.1.1 || 7.4.0 || 7.0.6.1 || 7.2.5.1 || 7.4.1 || 7.2.6 || 7.4.1.1 || 7.0.6.2 || 7.2.7 || 7.2.5.2 || 7.3.1.2 || 7.2.8 || 7.6.0 || 7.4.2 || 7.2.8.1 || 7.0.6.3 || 7.4.2.1 || 7.2.9 || 7.0.7 || 7.7.0 || 7.4.2.2 || 7.2.10 || 7.6.1 || 7.4.2.3 || 7.0.8 || 7.6.2 || 7.7.10 || 7.2.10.1 || 7.0.8.1 || 7.6.2.1 || 7.2.10.2 || 7.7.10.1 || 7.4.2.4 || 7.4.3 || 7.6.3 || 7.7.11 || 7.6.4 || 10.0.0 || 7.4.4 || 7.4.5 || 7.0.9 || 7.2.11 || 7.7.12 || 7.6.5 || 7.4.6 || 10.0.1 || 7.4.7 | Not reported |
| Cisco/Cisco Secure Firewall Threat Defense (FTD) Softwaregeneric | 7.0.0.1 || 7.0.1 || 7.0.1.1 || 7.0.2 || 7.0.2.1 || 7.0.3 || 7.0.4 || 7.0.5 || 7.3.0 || 7.3.1 || 7.0.6 || 7.3.1.1 || 7.4.0 || 7.0.6.1 || 7.4.1 || 7.0.6.2 || 7.4.1.1 || 7.3.1.2 || 7.6.0 || 7.4.2 || 7.0.6.3 || 7.4.2.1 || 7.0.7 || 7.7.0 || 7.4.2.2 || 7.6.1 || 7.4.2.3 || 7.0.8 || 7.6.2 || 7.7.10 || 7.7.11 || 7.0.8.1 || 7.6.2.1 || 7.7.10.1 || 7.4.2.4 || 7.4.3 || 7.6.4 || 10.0.0 || 7.4.4 || 7.0.9 || 7.4.7 | Not reported |
Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 16, 2026
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-2026-20331 are related to the failure of protection mechanisms issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-693.
Quoted source text, attributed separately from HOL analysis.