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9.9

Cisco Secure Firewall products mishandle errors, risking disruption

CVE-2026-20329 · published 1 month ago
Summary

Cisco's Adaptive Security Appliance, Firewall Threat Defense, and Management Center software have flaws in how they handle unexpected situations. These flaws could cause the devices to behave incorrectly or stop working, potentially affecting network security and availability. Apply the latest Cisco hardening update as soon as possible to correct the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
cisco cisco secure firewall adaptive security appliance (asa) software 9.16.1
cisco cisco secure firewall management center (fmc) 7.0.0
cisco cisco secure firewall threat defense (ftd) software 7.0.0.1
Original advisory text
Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software and Secure Firewall Management Center Software Hardening Release - Exceptional Conditions Handling Vulnerabilities
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-2026-20329 are related to issues concerning improper handling of exceptional conditions that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-703.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.9 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-703Improper Check or Handling of Exceptional Conditions
Timeline
Published16 Sep 2026
Updated4 Nov 2026
First seen16 Sep 2026
Sources
CVE-2026-20329 · NVD
CVE-2026-20329 · MITRE
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