This indicates an attack attempt to exploit a Buffer Overflow vulnerability in Yokogawa CENTUM CS 3000.
The vulnerability is due to an improper boundary check condition in the application when handling a malformed request. A remote attacker may be able to exploit this to cause a denial of service condition on the affected system.
Yokogawa CENTUM CS 3000 R3.09.50 and earlier
Denial of Service: Remote attackers can crash vulnerable systems.
Apply the most recent upgrade or patch from the vendor.