This indicates an attack attempt against an Integer Overflow vulnerability in Smart Software Solutions CoDeSys.
The vulnerability is due to a lack of validation of a user-supplied length value. Successful attacks may allow attackers to execute arbitrary code within the context of the service.
Smart Software Solutions CoDeSys 3.4 SP4 patch 2 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently we are not aware of any vendor supplied patches.