This indicates an attack attempt against a Denial of Service vulnerability in OpenLDAP.
The vulnerability is caused by an error when the vulnerable software handles a malicious LDAP message request. It allows a remote attacker to crash vulnerable systems via a crafted LDAP request.
OpenLDAP Foundation OpenLDAP prior to commit 7a5a98577a0481d864
Denial of Service: Remote attacker can crash vulnerable systems.
Apply the most recent upgrade or patch from the vendor.