This indicates an attempt to exploit a buffer overflow vulnerability in HP OpenView Network Node Manager.
The vulnerability is in OVAS.EXE, and is caused by a faulty user input check of the HTTP URL length. It can be triggered by an overly long HTTP GET request sent to port 7510/TCP. As a result, a remote attacker may be able to execute arbitrary code.
Openview 7.5.1 and prior.
System compromise: remote code execution.
Currently we are not aware of any vendor supplied patch for this issue.