A few weeks ago I decided to take a look at the Wi-Fi Protected Setup (WPS) technology. I noticed a few really bad design decisions which enable an efficient brute force attack, thus effectively breaking the security of pretty much all WPS-enabled Wi-Fi routers. As all of the more recent router models come with WPS enabled by default, this affects millions of devices worldwide.
Two hours and the WiFi network you thought was secure can be compromised. In addition to possible negative health effects from a router sitting right next to you transmitting WiFi signals at maximum power, the relatively high potential for security breaches make the inconvenience of hardwired Internet connectivity at our home worthwhile.
Update: Viehbock has released his tool to brute force crack WPS.