CVE-2026-20020 MEDIUM

CVE-2026-20020

Vendor Cisco
Product Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
Weakness CWE-20 · Input validation
Published March 4, 2026
Last update March 4, 2026

CVSS base score

6.8/10
Attack vector Adjacent
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

What the vulnerability does

01Description

A vulnerability in the OSPF protocol of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software could allow an unauthenticated, adjacent attacker to cause an affected device to reload unexpectedly, resulting in a DoS condition. If OSPF authentication is enabled, the attacker must know the secret key to exploit this vulnerability. This vulnerability is due to insufficient input validation when processing OSPF update packets. An attacker could exploit this vulnerability by sending crafted OSPF update packets. A successful exploit could allow the attacker to create a buffer overflow, causing the affected device to reload, resulting in a DoS condition.

Key dates

02Disclosure timeline

March 4, 2026 CVE published
March 4, 2026 Record updated