CVE-2020-25654: Clusterlabs Pacemaker

High severity, CVSS 7.2. EPSS: 1.9% chance of exploitation in the next 30 days.

An ACL bypass flaw was found in pacemaker. An attacker having a local account on the cluster and in the haclient group could use IPC communication with various daemons directly to perform certain tasks that they would be prevented by ACLs from doing if they went through the configuration.

Affected products

• Clusterlabs Pacemaker: before 1.1.23 (fixed in 1.1.23); from 2.0.0, before 2.0.3 (fixed in 2.0.3); version 2.0.5 only
• Debian Debian Linux: version 9.0 only

Published 2020-11-24. Last modified 2026-06-17.