CVE-2026-20331

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

View on CVE.org

Published Sep 16, 2026 CVSS 3.1 · 9.6 Critical EPSS < 1% KEV · Not listed

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.

Affected Products

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	—
`9.20.4.235`	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.

Vendor Product Versions

Cisco

Adaptive Security Appliance Software

Version	Status	Scheme	Platform
`[9.16.1,9.22.3.191]`	affected	generic	—

Cisco

Identity Services Engine Passive Identity Connector

Version	Status	Scheme	Platform
`[7.0.0.1,7.4.7]`	affected	generic	—

Cisco

Secure Firewall Management Center

Version	Status	Scheme	Platform
`[7.0.0,10.0.1]`	affected	generic	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

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.

Exploit prediction score: < 1% (0.260% probability within 30 days)

Exploitation none

Automatable no

Technical Impact total

References

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

History

Sep 19, 2026 11:00 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Cisco Cisco adaptive Security Appliance Software Cisco identity Services Engine Passive Identity Connector Cisco secure Firewall Management Center
Vendors & Products		Cisco Cisco adaptive Security Appliance Software Cisco identity Services Engine Passive Identity Connector Cisco secure Firewall Management Center

Sep 16, 2026 6:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Sep 16, 2026 5:15 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

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		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-asaftdfmc-uvpPROhN
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'}`