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Critical · 9.9 Public exploit CVE-2026-20329 EUVD-2026-81095GHSA-p9gc-crmq-wcr6

Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software and Secure Firewall Management Center Software Hardening Release - Exceptional Conditions Handling Vulnerabilities

Published Sep 16, 2026 · Updated Sep 18, 2026 · Assigned by cisco

Vendor: Cisco Product: Cisco Secure Firewall Adaptive Security Appliance (ASA) Software Product: Cisco Secure Firewall Management Center (FMC) Product: Cisco Secure Firewall Threat Defense (FTD) Software Category: Network devices

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-2026-20329 are related to issues concerning improper handling of exceptional conditions that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-703.

Affected products

VendorProductAffectedFixed
Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.1, 9.16.1.28, 9.16.2, 9.16.2.3, 9.16.2.7, 9.16.2.11, 9.16.2.13, 9.16.2.14, 9.16.3.3, 9.16.3, 9.16.3.14, 9.16.3.15, 9.18.1.3, 9.18.2, 9.16.3.19, 9.16.3.23, 9.18.2.5, 9.16.4, 9.18.2.7, 9.16.4.9, 9.18.2.8, 9.16.4.14, 9.18.3, 9.16.4.18, 9.18.3.39, 9.16.4.19, 9.18.3.46, 9.16.4.27, 9.18.3.53, 9.18.3… —
Cisco Cisco Secure Firewall Management Center (FMC) 7.0.0, 7.0.0.1, 7.0.1, 7.0.1.1, 7.0.2, 7.2.0, 7.0.2.1, 7.0.3, 7.2.0.1, 7.0.4, 7.2.1, 7.0.5, 7.3.0, 7.2.2, 7.3.1, 7.2.3, 7.2.3.1, 7.2.4, 7.0.6, 7.2.4.1, 7.2.5, 7.3.1.1, 7.4.0, 7.0.6.1, 7.2.5.1, 7.4.1, 7.2.6, 7.4.1.1, 7.0.6.2, 7.2.7, 7.2.5.2, 7.3.1.2, 7.2.8, 7.6.0, 7.4.2, 7.2.8.1, 7.0.6.3, 7.4.2.1, 7… —
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0.1, 7.0.1, 7.0.1.1, 7.0.2, 7.0.2.1, 7.0.3, 7.0.4, 7.0.5, 7.3.0, 7.3.1, 7.0.6, 7.3.1.1, 7.4.0, 7.0.6.1, 7.4.1, 7.0.6.2, 7.4.1.1, 7.3.1.2, 7.6.0, 7.4.2, 7.0.6.3, 7.4.2.1, 7.0.7, 7.7.0, 7.4.2.2, 7.6.1, 7.4.2.3, 7.0.8, 7.6.2, 7.7.10, 7.7.11, 7.0.8.1, 7.6.2.1, 7.7.10.1, 7.4.2.4, 7.4.3, 7.6.4, 10.0.… —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 3

References