Vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software

[ Why it matters ]Priority signals

• Critical severity: CVSS 9.9

[ Description ]Official 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-2026-20330 are related to improper neutralization issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-707.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• NCSC-NL28 Oct 2026NCSC-2026-0458

  Vulnerabilities fixed in Cisco Secure Firewall ASA, Threat Defense and Management Center Translated from Dutch

  Probability/damage M/HCVE-2026-20329CVE-2026-20330CVE-2026-20331+5 more CVEs

[ References ]References

• sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardenin…