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6.8
Cisco Firewalls Can Be Restarted by a Nearby Attacker
CVE-2026-20020
Summary
A flaw in the way Cisco firewalls process certain network messages can allow an attacker on the same network to cause the firewall to shut down. This could happen if the firewall is configured to use a secret key to verify incoming messages, but the attacker knows the key. To protect against this, ensure that OSPF authentication is enabled on your firewalls and that you use strong, unique keys.
Original title
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 unex...
Original description
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.
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.
nvd CVSS3.1
6.8
Vulnerability type
CWE-20
Improper Input Validation
Published: 4 Mar 2026 · Updated: 13 Mar 2026 · First seen: 6 Mar 2026