This indicates an attack attempt to exploit a Stack Buffer Overflow Vulnerability in Eaton HmiSoft VU3.
The vulnerability is due to improper handling of the wTextLen element in VU3 files. A remote attacker can exploit this vulnerability by enticing a target user into opening a crafted VU3 file. Successful exploitation could result in the execution of arbitrary code under the security context of the user running HMiSoft.
Eaton HmiSoft VU3 3.00.23 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.