VULNERABILITY INTELLIGENCE

CVE-2021-40125

CVSS score5.3 MEDIUM
EPSS probability1.02%
CISA KEVNot currently listed
Published2021-10-27
Last modified2026-08-11
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Description

A vulnerability in the Internet Key Exchange Version 2 (IKEv2) implementation of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to trigger a denial of service (DoS) condition on an affected device. This vulnerability is due to improper control of a resource. An attacker with the ability to spoof a trusted IKEv2 site-to-site VPN peer and in possession of valid IKEv2 credentials for that peer could exploit this vulnerability by sending malformed, authenticated IKEv2 messages to an affected device. A successful exploit could allow the attacker to trigger a reload of the device.

Weakness classification

  • psirt@cisco.com: CWE-416
  • nvd@nist.gov: CWE-400

Primary references