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.

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software unknown
Version Status Constraints
9.16.1 affected —
9.16.1.28 affected —
9.16.2 affected —
9.16.2.3 affected —
9.16.2.7 affected —
9.16.2.11 affected —
9.16.2.13 affected —
9.16.2.14 affected —
9.16.3.3 affected —
9.16.3 affected —
9.16.3.14 affected —
9.16.3.15 affected —
9.18.1.3 affected —
9.18.2 affected —
9.16.3.19 affected —
9.16.3.23 affected —
9.18.2.5 affected —
9.16.4 affected —
9.18.2.7 affected —
9.16.4.9 affected —
9.18.2.8 affected —
9.16.4.14 affected —
9.18.3 affected —
9.16.4.18 affected —
9.18.3.39 affected —
9.16.4.19 affected —
9.18.3.46 affected —
9.16.4.27 affected —
9.18.3.53 affected —
9.18.3.55 affected —
9.16.4.38 affected —
9.16.4.39 affected —
9.18.3.56 affected —
9.20.1 affected —
9.16.4.42 affected —
9.18.4 affected —
9.20.1.5 affected —
9.18.4.5 affected —
9.16.4.48 affected —
9.18.4.8 affected —
9.20.2 affected —
9.16.4.55 affected —
9.18.4.22 affected —
9.20.2.10 affected —
9.16.4.57 affected —
9.18.4.24 affected —
9.20.2.21 affected —
9.16.4.61 affected —
9.18.4.29 affected —
9.20.2.22 affected —
9.16.4.62 affected —
9.18.4.34 affected —
9.20.3 affected —
9.16.4.67 affected —
9.16.4.70 affected —
9.18.4.40 affected —
9.23.1 affected —
9.22.1.1 affected —
9.16.4.71 affected —
9.20.3.4 affected —
9.18.4.47 affected —
9.20.3.7 affected —
9.16.4.76 affected —
9.20.3.9 affected —
9.18.4.50 affected —
9.22.1.3 affected —
9.20.3.10 affected —
9.22.1.2 affected —
9.18.4.52 affected —
9.20.3.13 affected —
9.22.1.6 affected —
9.18.4.53 affected —
9.16.4.82 affected —
9.22.2 affected —
9.20.3.16 affected —
9.19.1.42 affected —
9.18.4.57 affected —
9.16.4.84 affected —
9.23.1.3 affected —
9.20.3.20 affected —
9.22.2.4 affected —
9.23.1.7 affected —
9.20.4 affected —
9.22.2.9 affected —
9.23.1.13 affected —
9.20.4.7 affected —
9.22.2.13 affected —
9.18.4.66 affected —
9.20.4.10 affected —
9.23.1.19 affected —
9.16.4.85 affected —
9.22.2.14 affected —
9.18.4.67 affected —
9.24.1 affected —
9.18.4.68 affected —
9.23.1.22 affected —
9.20.4.14 affected —
9.22.2.20 affected —
9.18.4.71 affected —
9.20.4.19 affected —
9.23.1.26 affected —
9.16.4.89 affected —
9.22.2.32 affected —
9.18.4.76 affected —
9.22.3 affected —
9.24.1.5 affected —
9.20.4.22 affected —
9.24.1.9 affected —
9.20.4.28 affected —
9.22.3.5 affected —
9.16.4.92 affected —
9.18.4.135 affected —
9.23.1.195 affected —
9.20.4.30 affected —
9.24.1.155 affected —
9.23.1.32 affected —
9.24.1.11 affected —
9.20.4.34 affected —
9.18.4.82 affected —
9.24.10 affected —
9.23.1.211 affected —
9.20.4.235 affected —
9.24.1.221 affected —
9.22.3.191 affected —
Cisco Cisco Secure Firewall Management Center (FMC) unknown
Version Status Constraints
7.0.0 affected —
7.0.0.1 affected —
7.0.1 affected —
7.0.1.1 affected —
7.0.2 affected —
7.2.0 affected —
7.0.2.1 affected —
7.0.3 affected —
7.2.0.1 affected —
7.0.4 affected —
7.2.1 affected —
7.0.5 affected —
7.3.0 affected —
7.2.2 affected —
7.3.1 affected —
7.2.3 affected —
7.2.3.1 affected —
7.2.4 affected —
7.0.6 affected —
7.2.4.1 affected —
7.2.5 affected —
7.3.1.1 affected —
7.4.0 affected —
7.0.6.1 affected —
7.2.5.1 affected —
7.4.1 affected —
7.2.6 affected —
7.4.1.1 affected —
7.0.6.2 affected —
7.2.7 affected —
7.2.5.2 affected —
7.3.1.2 affected —
7.2.8 affected —
7.6.0 affected —
7.4.2 affected —
7.2.8.1 affected —
7.0.6.3 affected —
7.4.2.1 affected —
7.2.9 affected —
7.0.7 affected —
7.7.0 affected —
7.4.2.2 affected —
7.2.10 affected —
7.6.1 affected —
7.4.2.3 affected —
7.0.8 affected —
7.6.2 affected —
7.7.10 affected —
7.2.10.1 affected —
7.0.8.1 affected —
7.6.2.1 affected —
7.2.10.2 affected —
7.7.10.1 affected —
7.4.2.4 affected —
7.4.3 affected —
7.6.3 affected —
7.7.11 affected —
7.6.4 affected —
10.0.0 affected —
7.4.4 affected —
7.4.5 affected —
7.0.9 affected —
7.2.11 affected —
7.7.12 affected —
7.6.5 affected —
7.4.6 affected —
10.0.1 affected —
7.4.7 affected —
Cisco Cisco Secure Firewall Threat Defense (FTD) Software unknown
Version Status Constraints
7.0.0.1 affected —
7.0.1 affected —
7.0.1.1 affected —
7.0.2 affected —
7.0.2.1 affected —
7.0.3 affected —
7.0.4 affected —
7.0.5 affected —
7.3.0 affected —
7.3.1 affected —
7.0.6 affected —
7.3.1.1 affected —
7.4.0 affected —
7.0.6.1 affected —
7.4.1 affected —
7.0.6.2 affected —
7.4.1.1 affected —
7.3.1.2 affected —
7.6.0 affected —
7.4.2 affected —
7.0.6.3 affected —
7.4.2.1 affected —
7.0.7 affected —
7.7.0 affected —
7.4.2.2 affected —
7.6.1 affected —
7.4.2.3 affected —
7.0.8 affected —
7.6.2 affected —
7.7.10 affected —
7.7.11 affected —
7.0.8.1 affected —
7.6.2.1 affected —
7.7.10.1 affected —
7.4.2.4 affected —
7.4.3 affected —
7.6.4 affected —
10.0.0 affected —
7.4.4 affected —
7.0.9 affected —
7.4.7 affected —

No data.

No data.

No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-asaftdfmc-uvpPROhN cve-icon cve-icon
History

Wed, 16 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 16 Sep 2026 17:15:00 +0000

Type Values Removed Values Added
Description 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.
Title Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software and Secure Firewall Management Center Software Hardening Release - Protection Mechanism Failure Vulnerabilities
Weaknesses CWE-693
References
Metrics cvssV3_1

{'score': 9.6, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L'}

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-09-16T20:05:55.134Z

Reserved: 2025-10-08T11:59:15.412Z

Link: CVE-2026-20331

cve-icon Vulnrichment

Updated: 2026-09-16T17:33:45.777Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-16T17:17:17.107

Modified: 2026-09-16T19:16:15.097

Link: CVE-2026-20331

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses