CVE-2011-1024: Openldap

Medium severity, CVSS 4.6. EPSS: 2.6% chance of exploitation in the next 30 days.

chain.c in back-ldap in OpenLDAP 2.4.x before 2.4.24, when a master-slave configuration with a chain overlay and ppolicy_forward_updates (aka authentication-failure forwarding) is used, allows remote authenticated users to bypass external-program authentication by sending an invalid password to a slave server.

Affected products

• Openldap Openldap: version 2.4.6 only; version 2.4.7 only; version 2.4.8 only; version 2.4.9 only; version 2.4.10 only; version 2.4.11 only; …

Published 2011-03-20. Last modified 2026-06-16.