This indicates an attack attempt against a Stack Buffer Overflow vulnerability in Eaton ELCSoft.
The vulnerability is caused by an error when ELCSimulator handles overly large network packets. A remote attacker may be able to exploit this to execute arbitrary code on vulnerable systems via a crafted packet.
Eaton ELCSoft 2.4.01
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently we are unaware of any vendor supplied patch for this issue.