A security vendor says it discovered a flaw in Comcast’s home security system that could let criminals break into houses undetected by using radio jamming equipment. The vendor, Rapid7, says it alerted Comcast to the problem two months ago but never received a response from the company. Comcast told Ars that Rapid7 e-mailed the wrong address and said it will work with other companies to find a solution. The flaw affects Comcast’s implementation of the ZigBee wireless protocol, which uses low-cost wireless networks.”]