🔐 CVE Alert

CVE-2026-20331

CRITICAL 9.6

Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software and Secure Firewall Management Center Software Hardening Release - Protection Mechanism Failure Vulnerabilities

CVSS Score
9.6
EPSS Score
0.0%
EPSS Percentile
0th

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.

CWE CWE-693
Vendor cisco
Product cisco secure firewall adaptive security appliance (asa) software
Ecosystems
Industries
NetworkingTelecommunications
Published Sep 16, 2026
Last Updated Sep 16, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
Low

Affected Versions

Cisco / Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
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
Cisco / Cisco Secure Firewall Management Center (FMC)
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
Cisco / Cisco Secure Firewall Threat Defense (FTD) Software
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

References

NVD ↗ CVE.org ↗ EPSS Data ↗
sec.cloudapps.cisco.com: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-asaftdfmc-uvpPROhN