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    CVE-2026-20331

    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.

    Published:Sep 16, 2026
    Last Modified:Sep 19, 2026
    EPS:Sep 16, 2026
    EPSS Score:0.00229
    CVSS Score:9.6

    Affected Products

    Vendor
    Cisco
    Product
    Adaptive Security Appliance Software
    Vendor
    Cisco
    Product
    Identity Services Engine Passive Identity Connector
    Vendor
    Cisco
    Product
    Secure Firewall Management Center

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-693 Protection Mechanism Failure

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs
    CAPEC-107 Cross Site Tracing
    CAPEC-127 Directory Indexing
    CAPEC-17 Using Malicious Files
    CAPEC-20 Encryption Brute Forcing
    CAPEC-22 Exploiting Trust in Client
    CAPEC-237 Escaping a Sandbox by Calling Code in Another Language
    CAPEC-36 Using Unpublished Interfaces or Functionality
    CAPEC-477 Signature Spoofing by Mixing Signed and Unsigned Content
    CAPEC-480 Escaping Virtualization
    CAPEC-51 Poison Web Service Registry
    CAPEC-57 Utilizing REST's Trust in the System Resource to Obtain Sensitive Data
    CAPEC-59 Session Credential Falsification through Prediction
    CAPEC-65 Sniff Application Code
    CAPEC-668 Key Negotiation of Bluetooth Attack (KNOB)
    CAPEC-74 Manipulating State
    CAPEC-87 Forceful Browsing

    Related CVEs

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    CVE-2026-20336 (CVSS 8.8) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Adaptive Sec…
    CVE-2026-20249 (CVSS 8.6) — A vulnerability in the certification authentication feature of Internet Key Exchange version 2 (IKEv2) fo…
    CVE-2026-20335 (CVSS 8.1) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Adaptive Sec…
    CVE-2026-20330 (CVSS 9.9) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Adaptive Sec…
    CVE-2026-20329 (CVSS 9.9) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Adaptive Sec…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High