This indicates an attack attempt to exploit a Denial of Service vulnerability in Avaya WinPDM.
The vulnerability is due to an improper boundary check condition in the application when the Unite Host Router service handles requests with overly long parameters in certain fields. A remote attack may be able to exploit this to cause a denial of service condition on the affected system.
Avaya WinPDM UniteHostRouter
System Compromise: Remote attackers can crash vulnerable systems.
Currently we are not aware of any vendor supplited patch for this issue.