This indicates an attack attempt to exploit a Buffer Overflow vulnerability in HP OpenView Network Node Manager.
The vulnerability is due to an improper boundary check condition in the application when handling an overly long HTTP request. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted HTTP request.
HP OpenView Network Node Manager (OV NNM) 6.41
HP OpenView Network Node Manager (OV NNM) 7.01
HP OpenView Network Node Manager (OV NNM) 7.51
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.