This indicates an attack attempt to exploit a Buffer Overflow vulnerability in IBM Lotus Domino.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted packet.
IBM Domino 188.8.131.52
IBM Domino 9.0.1
IBM Domino 8.5
IBM Domino 9.0
IBM Domino 8.5.1
IBM Domino 8.5.2
IBM Domino 8.5.3
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.