#VU123657 Buffer overflow in Cisco Adaptive Security Appliance (ASA) and Cisco Firewall Threat Defense (FTD) - CVE-2026-20020

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Main Vulnerability Database Vulnerabilities #VU123657

#VU123657 Buffer overflow in Cisco Adaptive Security Appliance (ASA) and Cisco Firewall Threat Defense (FTD) - CVE-2026-20020

Published: March 9, 2026


Vulnerability identifier: #VU123657
Vulnerability risk: Low
CVSSv4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-20020
CWE-ID: CWE-119
Exploitation vector: Adjecent network
Exploit availability: No public exploit available
Vulnerable software:
Cisco Adaptive Security Appliance (ASA)
Cisco Firewall Threat Defense (FTD)
Software vendor:
Cisco Systems, Inc

Description

The vulnerability allows a remote user to perform a denial of service attack.

The vulnerability exists due to a boundary error in the OSPF protocol. A remote user on the local network can send specially crafted OSPF update packets to the system, trigger memory corruption and perform a denial of service attack. 


Remediation

Install updates from vendor's website.

External links