CVE-2021-4091: PORT389 389-Ds-Base

High severity, CVSS 7.5. EPSS: 2% chance of exploitation in the next 30 days.

A double-free was found in the way 389-ds-base handles virtual attributes context in persistent searches. An attacker could send a series of search requests, forcing the server to behave unexpectedly, and crash.

Affected products

• PORT389 389-Ds-Base: before 1.3.10.2 (fixed in 1.3.10.2)
• Red Hat Enterprise Linux Desktop: version 7 only
• Red Hat Enterprise Linux For IBM Z Systems: version 7.0 only
• Red Hat Enterprise Linux For Power Big Endian: version 7.0 only
• Red Hat Enterprise Linux For Power Little Endian: version 7.0 only
• Red Hat Enterprise Linux For Scientific Computing: version 7.0 only
• Red Hat Enterprise Linux Server: version 7.0 only
• Red Hat Enterprise Linux Workstation: version 7.0 only

Published 2022-02-18. Last modified 2026-06-17.