Siemens WinCC flexible 2004 2005 2007 and 2008; WinCC V11 (aka TIA portal); the TP OP MP Comfort Panels and Mobile Panels SIMATIC HMI panels; WinCC V11 Runtime Advanced; and WinCC flexible Runtime allow user-assisted remote attackers to execute arbitrary code via a crafted project file related to the HMI web server and runtime loader.