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6.8
Cisco Firewalls Crash When Attacker Sends Malicious OSPF Packets
CVE-2026-20025
Summary
An attacker with the right password can send malicious packets to a Cisco firewall, causing it to crash and stop working. This is a serious problem because it can make the firewall unavailable, potentially exposing your network to other attacks. To protect yourself, make sure to keep your Cisco firewalls up to date with the latest security patches.
Original title
A vulnerability in the OSPF protocol of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software could allow an authenticated, adjacent attacker to cause an affected device to reload unexpe...
Original description
A vulnerability in the OSPF protocol of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software could allow an authenticated, adjacent attacker to cause an affected device to reload unexpectedly, resulting in a DoS condition. To exploit this vulnerability, the attacker must have the OSPF secret key.
This vulnerability is due to insufficient input validation when processing OSPF link-state update (LSU) packets. An attacker could exploit this vulnerability by sending crafted OSPF LSU packets. A successful exploit could allow the attacker to corrupt the heap, causing the device to reload, resulting in a DoS condition.
This vulnerability is due to insufficient input validation when processing OSPF link-state update (LSU) packets. An attacker could exploit this vulnerability by sending crafted OSPF LSU packets. A successful exploit could allow the attacker to corrupt the heap, causing the device to reload, resulting in a DoS condition.
nvd CVSS3.1
6.8
Vulnerability type
CWE-190
Integer Overflow
Published: 4 Mar 2026 · Updated: 13 Mar 2026 · First seen: 6 Mar 2026