This indicates an attack attempt to exploit a Stack Overflow vulnerability in VIPA Controls WinPLC7.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted packet. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted client request.
VIPA Controls WinPLC Versions 184.108.40.20621 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply patch, available from the web site.