A typo on callstranger.com website

[a1batross]

You need to patch your devices' UPnP stack depending on new UPnP Spesification on OCF Web site. Some UPnP stacks like miniupnp (after 2011) are not vulnerable

Spesification -> Specification

(didn't found the source of this page, so I've posted there)

[yunuscadirci]

Thanks. corrected