This indicates an attack attempt against an Arbitrary File Upload vulnerability in BigAnt Instant Messaging Server.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the AntDS.exe component of the application when handling maliciously crafted messages. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted request.
BigAnt Messaging Server 2.96 and earlier versions
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently we are unaware of any vendor supplied patch or updates available for this issue.