Improper Neutralization in Cisco Secure Firewall Threat Defense (FTD) and Cisco Adaptive Security Appliance (ASA) - CVE-2026-20330
Published: September 17, 2026
Vulnerability identifier: #VU150748
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20330
CWE-ID: CWE-707
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to compromise confidentiality, integrity, and availability.
The vulnerability exists due to failure to ensure structured messages or data are well-formed and meet security properties in Cisco Secure Firewall ASA Software, Cisco Secure FTD Software, and Cisco Secure FMC Software when accessed over a network. A remote user can access the software over a network to compromise confidentiality, integrity, and availability.
Affected software
Cisco Secure Firewall Threat Defense (FTD)
Cisco Adaptive Security Appliance (ASA)
Cisco Adaptive Security Appliance (ASA)
How to mitigate CVE-2026-20330
Install security update from vendor's website.
Cisco Secure Firewall Threat Defense (FTD) - addressed in versions 7.0.10, 7.2.12, 7.4.8, 7.6.6, 7.7.13, 10.0.2, 10.1.0
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.16.4.103, 9.18.4.94, 9.20.4.49, 9.22.3.26, 9.23.1.47, 9.24.1.26
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.16.4.103, 9.18.4.94, 9.20.4.49, 9.22.3.26, 9.23.1.47, 9.24.1.26