This indicates an attack attempt against a Denial of Service vulnerability in VMware vCenter Server.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted LDAP packet. A remote attacker may be able to exploit this to cause a denial of service condition on the affected system.
vCenter Server 6.0
vCenter Server 6.5
Denial of Service: Remote attackers can crash vulnerable systems.
Apply the most recent upgrade or patch from the vendor.