This indicates an attack attempt to exploit a remote Code Execution vulnerability in Rockwell Automation Connected Components Workbench.
The vulnerability is caused by an error in ActiveX control when handling a invalid property. An attacker can exploit this by tricking an unsuspecting user into visiting a malicious webpage and execute arbitrary code within the context of the current user.
Rockwell Automation Connected Components Workbench before 7.00.00
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the latest update from the vendor(must be a register user).