NETxAutomation NETxEIB OPC Server before 3.0.1300 does not properly validate OLE for Process Control (OPC) server handles which allows attackers to cause a denial of service or possibly execute arbitrary code via unspecified vectors involving the (1) IOPCSyncIO::Read (2) IOPCSyncIO::Write (3) IOPCServer::AddGroup (4) IOPCServer::RemoveGroup (5) IOPCCommon::SetClientName and (6) IOPCGroupStateMgt::CloneGroup functions which allow access to arbitrary memory. NOTE: the vectors might be limited to attackers with physical access.