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.

Vulnerability in Remote Access VPN (RAVPN) of Cisco ASA and FTD that was exploited in the wild in large-scale brute-force attacks to harvest credentials for follow-on attacks.

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.

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According to its self-reported version, Cisco Firepower Threat Defense Software is affected by a vulnerability.

  - 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. (CVE-2024-20481)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

According to its self-reported version, Cisco Adaptive Security Appliance (ASA) Software is affected by a vulnerability.

  - 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. (CVE-2024-20481)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

ID	Name	Product	Family	Type	Severity
506209	Cisco ASA Missing Release of Resource after Effective Lifetime (CVE-2024-20481)	Tenable OT Security	Tenable.ot	Remote	medium
209988	Cisco Firepower Threat Defense Software Remote Access VPN Brute Force DoS (cisco-sa-asaftd-bf-dos-vDZhLqrW)	Nessus	CISCO	Local	medium
209987	Cisco Adaptive Security Appliance Remote Access VPN Brute Force DoS (cisco-sa-asaftd-bf-dos-vDZhLqrW)	Nessus	CISCO	Local	medium

Detections

Analytics

CVE-2024-20481

medium

Tenable Plugins

medium

medium

medium