CVE-2026-20020
MEDIUMCVSS Vector
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Lifecycle Timeline
2Description
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.
Analysis
Insufficient input validation in Cisco Secure Firewall ASA and Secure FTD OSPF implementations allows adjacent attackers to trigger denial of service by sending malformed OSPF update packets that cause device reloads. Authentication bypass is possible if OSPF authentication is disabled, though knowing the secret key is required when authentication is enabled. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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