Unspecified vulnerability in the IOPCServer::RemoveGroup function in the OPCDA interface in Takebishi Electric DeviceXPlorer OLE for Process Control (OPC) Server before 3.12 Build3 allows remote attackers to execute arbitrary code via unspecified vectors involving access to arbitrary memory. NOTE: this issue affects the (1) HIDIC, (2) MELSEC, (3) FA-M3, (4) MODBUS, and (5) SYSMAC OPC Servers.