OpenLDAP 2.4.x < 2.4.24 - Denial of Service via Empty OldDN in MODRDN Operation
modrdn.c in slapd in OpenLDAP 2.4.x before 2.4.24 allows remote attackers to cause a denial of service (daemon crash) via a relative Distinguished Name (DN) modification request (aka MODRDN operation) that contains an empty value for the OldDN field.