Heap-based buffer overflow in Cisco Adaptive Security Appliance (ASA) and Cisco Firewall Threat Defense (FTD) - CVE-2026-20024

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Main Vulnerability Database Vulnerabilities #VU123661

Heap-based buffer overflow in Cisco Adaptive Security Appliance (ASA) and Cisco Firewall Threat Defense (FTD) - CVE-2026-20024

Published: March 10, 2026


Vulnerability identifier: #VU123661
CSH Severity: Low
CVSS v4.0: 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-2026-20024
CWE-ID: CWE-122
Exploitation vector: Adjecent network
Exploit availability: No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
Cisco Adaptive Security Appliance (ASA)
Cisco Firewall Threat Defense (FTD)

Detailed vulnerability description

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

The vulnerability exists due to a boundary error when parsing OSPF packets. A remote user on the local network can send specially crafted OSPF packets to the affected device, trigger a heap-based buffer overflow and perform a denial of service attack.


How to mitigate CVE-2026-20024

Install updates from vendor's website.

Sources