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CVE-2026-20020

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…

Published Mar 4, 2026 · updated Aug 11, 2026 · cisco adaptive security appliance software

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.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 4, 2026 · NIST NVD

    Detected

    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

  2. Aug 11, 2026 · NIST NVD

    Updated

    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

Affected

  • cpe cisco/adaptive security appliance software9.12.1
  • cpe cisco/adaptive security appliance software9.12.1.2
  • cpe cisco/adaptive security appliance software9.12.1.3
  • cpe cisco/adaptive security appliance software9.12.2
  • cpe cisco/adaptive security appliance software9.12.2.1
  • cpe cisco/adaptive security appliance software9.12.2.4
  • cpe cisco/adaptive security appliance software9.12.2.5
  • cpe cisco/adaptive security appliance software9.12.2.9
  • cpe cisco/secure firewall threat defense6.4.0

Sources

  • CVE.orgVulnerability recordCVE-2026-20020

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2026-20020

    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 atta

    nvd.nist.gov

References