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.
http://www.us-cert.gov/control_systems/pdf/ICSA-12-030-01.pdf