VULNERABILITY INTELLIGENCE

CVE-2023-20233

CVSS score4.3 MEDIUM
EPSS probability0.34%
CISA KEVNot currently listed
Published2023-09-13
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Description

A vulnerability in the Connectivity Fault Management (CFM) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to incorrect processing of invalid continuity check messages (CCMs). An attacker could exploit this vulnerability by sending crafted CCMs to an affected device. A successful exploit could allow the attacker to cause the CFM service to crash when a user displays information about maintenance end points (MEPs) for peer MEPs on an affected device.

Weakness classification

  • CWE-354: Improper Validation of Integrity Check Value
  • CWE-476: NULL Pointer Dereference

Primary references