NBC News spreads word that a security firm called Rapid7 learned that between 40 million and 50 million home networking devices are vulnerable to attack via a security vulnerability in Universal Plug and Play (UPnP.). Rapid 7 offers a scanning tool on its website and recommends uers to disable the UPnP functionality in affected equipment. 

Security software maker Rapid7 said in a white paper to be released Tuesday that it discovered between 40 million and 50 million devices that were vulnerable to attack due to three separate sets of problems that the firm's researchers have identified with the UPnP standard. The long list of devices includes products from manufacturers including Belkin, D-Link, Cisco's Linksys division and Netgear. Representatives for Belkin, D-Link, Linksys and Netgear could not be reached for comment on Monday evening.

Rapid 7 has a very handy scanning tool availabe to see if you are vunerable right here.