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 when OSPF canonicalization debug is enabled by using the command debug ip ospf canon. This vulnerability is due to insufficient input validation when processing OSPF LSU packets. An attacker could exploit this vulnerability by sending crafted unauthenticated OSPF packets. A successful exploit could allow the attacker to write to memory outside of the packet data, causing the device to reload, resulting in a DoS condition.

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 when OSPF canonicalization debug is enabled by using the command debug ip ospf canon. This vulnerability is due to insufficient input validation when processing OSPF LSU packets. An attacker could exploit this vulnerability by sending crafted unauthenticated OSPF packets. A successful exploit could allow the attacker to write to memory outside of the packet data, causing the device to reload, resulting in a DoS condition.

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According to its self-reported version, Cisco ASA Software is affected by multiple vulnerabilities.

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

According to its self-reported version, Cisco Secure Firewall Threat Defense (FTD) Software is affected by multiple vulnerabilities.

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

ID	Name	Product	Family	Type	Severity
506178	Cisco ASA Use of Out-of-range Pointer Offset (CVE-2026-20022)	Tenable OT Security	Tenable.ot	Remote	medium
311450	Cisco Adaptive Security Appliance (ASA) Software OSPF DoS Vulnerabilities (cisco-sa-asaftd-ospf-ZH8PhbSW)	Nessus	CISCO	Local	medium
311444	Cisco Firepower Threat Defense (FTD) Software OSPF DoS Vulnerabilities (cisco-sa-asaftd-ospf-ZH8PhbSW)	Nessus	CISCO	Combined	medium

Detections

Analytics

CVE-2026-20022

medium

Tenable Plugins

medium

medium

medium