CVE-2026-20021

Name of the Vulnerable Software and Affected Versions Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software (affected versions not specified)

Description A flaw exists in the OSPF protocol implementation of the software that could allow a nearby, authorized attacker to deplete device memory, leading to a denial of service. This is caused by improper input validation when processing OSPF packets. An attacker can exploit this by sending specially crafted OSPF packets to the device. A successful exploit could exhaust memory, resulting in a denial of service condition.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.