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Findings

CVE-2026-20023

A vulnerability in the OSPF protocol of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could…

Published Mar 4, 2026 · updated Aug 11, 2026 · cisco secure firewall threat defense

A vulnerability in the OSPF protocol of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, adjacent attacker to corrupt memory on an affected device, resulting in a denial of service (DoS) condition. This vulnerability is due to memory corruption when parsing OSPF protocol packets. An attacker could exploit this vulnerability by sending crafted OSPF packets to an affected device. A successful exploit could allow the attacker to cause memory corruption causing the affected device to reboot, 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 Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, adjacent attacker to corrupt memory on an affected device, resulting in a denial of service (DoS) condition. This vulnerability is due to memory corruption when parsing OSPF protocol packets. An attacker cou

  2. Aug 11, 2026 · NIST NVD

    Updated

    A vulnerability in the OSPF protocol of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, adjacent attacker to corrupt memory on an affected device, resulting in a denial of service (DoS) condition. This vulnerability is due to memory corruption when parsing OSPF protocol packets. An attacker cou

Affected

  • cpe cisco/adaptive security appliance software9.12.1
  • cpe cisco/secure firewall threat defense6.4.0
  • cpe cisco/secure firewall threat defense6.4.0.1
  • cpe cisco/secure firewall threat defense6.4.0.2
  • cpe cisco/secure firewall threat defense6.4.0.3
  • cpe cisco/secure firewall threat defense6.4.0.4
  • cpe cisco/secure firewall threat defense6.4.0.5
  • cpe cisco/secure firewall threat defense6.4.0.6
  • cpe cisco/secure firewall threat defense6.4.0.7

Sources

  • NIST NVDVulnerability recordCVE-2026-20023

    A vulnerability in the OSPF protocol of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, adjacent attacker to corrupt memory on an affected device, resulting in a denial of ser

    nvd.nist.gov

References