CVE-2011-1081: modrdn.c in slapd in OpenLDAP 2.4.x before 2.4.24 allows remote attackers to cause a denial of service (dae...

Security readout for executives and security teams

CVE-2011-1081 is a denial-of-service flaw in OpenLDAP slapd. A crafted relative DN modification request could crash the directory daemon. For businesses, the main risk is interruption to LDAP-backed login, identity lookup, or application authentication services, not data theft or code execution based on the provided sources. Exposure is likely limited to systems running OpenLDAP slapd 2.4.x before 2.4.24, or vendor packages without the relevant backport. Internet-facing or broadly reachable LDAP services would carry more operational risk because a crash can affect dependent authentication and directory workflows. Prioritize remediation where LDAP supports sign-on, identity services, VPN, email, or business-critical applications. The flaw is old and fixed, but a crash of central directory infrastructure can cause visible outage. It should be handled through normal vulnerability management, escalated for exposed or critical LDAP services. Mitigation focus: Upgrade OpenLDAP to 2.4.24 or a vendor-fixed package.; Check distribution advisories for backported fixes before judging by version string alone.; Restrict LDAP service exposure to trusted networks where operationally possible..

Prepared

Jun 24, 2026, 13:28 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.