Siemens SIMATIC WinCC, OpenPCS
The implementation of the RPC (Remote Procedure call) 
communication protocol in the affected products do not 
properly handle certain unorganized RPC messages. An 
attacker could use this vulnerability to cause a denial of service 
condition in the RPC server. The implementation of the RPC (Remote Procedure call) communication protocol in the affected products do not properly handle certain malformed RPC messages. An attacker could use this vulnerability to cause a denial of service condition in the RPC server.