This indicates an attack attempt to exploit a Buffer Overflow vulnerability in OMRON CX-One.
The vulnerability is caused by an error when handling malformed project files. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted project file.
OMRON CX-One CX-Programmer 9.66 and prior
OMRON CX-One CX-Server 5.0.23 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Refer to the ICS-CERT advisory for updates: