This indicates an attack attempt against a Buffer Overflow vulnerability in BigAnt Server.
The vulnerability is caused by a boundary check error when the vulnerable software handles a maliciously crafted DDNF request. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted DDNF request.
BigAntSoft BigAnt Server 2.97 SP7 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently we are unaware of any vendor supplied patch for this issue.