VULNERABILITY INTELLIGENCE

CVE-2023-20042

CVSS score6.8 MEDIUM
EPSS probability0.68%
CISA KEVNot currently listed
Published2023-11-01
Last modified2026-08-11
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

Description

A vulnerability in the AnyConnect SSL VPN feature 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) condition on an affected device. This vulnerability is due to an implementation error within the SSL/TLS session handling process that can prevent the release of a session handler under specific conditions. An attacker could exploit this vulnerability by sending crafted SSL/TLS traffic to an affected device, increasing the probability of session handler leaks. A successful exploit could allow the attacker to eventually deplete the available session handler pool, preventing new sessions from being established and causing a DoS condition.

Weakness classification

  • psirt@cisco.com: CWE-404
  • nvd@nist.gov: NVD-CWE-noinfo

Primary references