CVE-2024-20481

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.

Weakness: CWE-772.

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Changed

Confidentiality impact

None

Integrity impact

None

Availability impact

Low

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Cisco Adaptive Security Appliance (ASA) Software, Cisco Firepower Threat Defense Software, adaptive_security_appliance_software, firepower_threat_defense_software. NVD's record lists the exact affected versions.

• sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-bf-dos-vDZhLqrW Vendor Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-20481 US Government Resource