Cisco ASA and FTD Denial-of-Service Vulnerability

A remote attacker, without authentication, can achieve partial data exposure, partial service disruption. Federal agencies are required to remediate by 2024-11-14 under CISA BOD 22-01.

This is a Software Vulnerability (CWE-772) (CWE-772) vulnerability in Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD). A vulnerability in the Remote Access VPN (RAVPN) service of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) of the RAVPN service. This vulnerability is due to resource exhaustion. An attacker could exploit this vulnerability by sending a large number of VPN authentication requests to an affected device. A successful exploit could allow the attacker to exhaust resources, resulting in a DoS of the RAVPN service on the affected device. Depending on the impact of the attack, a reload of the device may be required to restore the RAVPN service. Services that are not related to VPN are not affected. Cisco Talos discussed these attacks in the blog post Large-scale brute-force activity targeting VPNs, SSH services with commonly used login credentials. Exploitation requires remote network access, low attack complexity, no authentication required, and no user interaction required.

Probably yes if any of these apply:

CISA added this CVE to the Known Exploited Vulnerabilities catalog on 2024-10-24 based on evidence of active exploitation in the wild. Federal agencies required to remediate by 2024-11-14.