Input validation error in Cisco Firewall Threat Defense (FTD) and Cisco Adaptive Security Appliance (ASA) - CVE-2026-20025
Published: March 10, 2026
Vulnerability identifier: #VU123662
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20025
CWE-ID: CWE-20
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input when processing OSPF link-state update (LSU) packets. A remote user with OSPF secret key can send specially crafted OSPF LSU packets to the device and perform a denial of service (DoS) attack.
Affected software
Cisco Firewall Threat Defense (FTD)
Cisco Adaptive Security Appliance (ASA)
Cisco Adaptive Security Appliance (ASA)
How to mitigate CVE-2026-20025
Install updates from vendor's website.
Cisco Firewall Threat Defense (FTD) - addressed in versions 7.0.9, 7.2.11, 7.4.3, 7.6.4, 7.7.11
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.16.4.85, 9.18.4.71, 9.20.4.10, 9.22.2.13, 9.23.1.19, 9.24.1
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.16.4.85, 9.18.4.71, 9.20.4.10, 9.22.2.13, 9.23.1.19, 9.24.1