CVE-2021-27212

Name of the Vulnerable Software and Affected Versions OpenLDAP versions 2.4.57 and 2.5.x through 2.5.1alpha

Description The issue is related to an assertion failure in the issuerAndThisUpdateCheck function, which can occur via a crafted packet with a short timestamp, resulting in a denial of service (daemon exit). This is related to schema init.c and checkTime. The vulnerability can be exploited by a remote attacker, allowing them to send a specially crafted packet to slapd and execute a denial of service attack.

Recommendations For OpenLDAP versions 2.4.57 and 2.5.x through 2.5.1alpha, consider disabling the issuerAndThisUpdateCheck function as a temporary workaround until a patch is available. Restrict access to the schema init.c and checkTime components to minimize the risk of exploitation. Avoid using crafted packets with short timestamps in the affected API endpoint until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.