CVE-2024-20481mediumunder attackCWE-772

CVE-2024-20481: medium-severity vulnerability in Cisco Adaptive Security Appliance (ASA) Software

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48Vexday Risk Score

Prioritize patching. It under exploitation confirmed by CISA.

ssvc Attendcvss 5.8epss 16%
from disclosure to weapon
Published on NVDOct 23
CISA KEV+1d
Action required by CISAfederal deadline: 2024-11-14

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

In short

A flaw in Cisco ASA and FTD VPN services allows attackers to flood the system with fake authentication requests, overwhelming it and disrupting VPN access for legitimate users.

Technical detail

The vulnerability stems from insufficient resource management (CWE-772) in the RAVPN service. An unauthenticated remote attacker can send a large volume of VPN authentication requests to exhaust server resources, triggering a denial of service condition that may require device restart to restore functionality.

Summary generated and translated by AI from the official description.

The full analysis of this CVE is available in Portuguese →

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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Affected products
Cisco · Cisco Adaptive Security Appliance (ASA) SoftwareCisco · Cisco Firepower Threat Defense Software
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