CVE-2023-20233

6.5 mediumEPSS 0.3%

Medium (6.5) in cisco ios xr. EPSS 0.3% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

6.5 medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 27% of CVEs (scores of 2026-10-31)
CWEs: CWE-354, CWE-476
Published: 2023-09-13
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

cisco:ios_xr

References

Check your stack JSON