1. Siemens S7 hack
NSS researcher Dillon Beresford demonstrated how to hack a Siemens S7 computer, gain read-and-write access to the memory, steal data, run commands and shut the computers off. All this is very bad when you consider these devices are used to control machines in factories, utility networks, power plants, chemical factories and the like. His findings were so troublesome that he pulled out of an earlier conference where he'd been scheduled to present the information until Siemens could patch the vulnerabilities he exposed.