This week a program was released to allow brute force cracking of vulnerabilities in wifi protected networks



From Warp2Search:

The program called reaver brute force cracks the encryption on almost all major routers (including Cisco/Linksys, Netgear, D-Link, Belkin, Buffalo, ZyXEL and Technicolor.)This program will brute force crack the push button connect encryption on newer routers allowing the device using reaver access to anything on the network.

  Major security flaw found that affects many popular routers