Universal Plug and Play (UPnP) implemented 277,000 Connected Devices are vulnerable to malicious proxy system UPnProxying. 45,000 have been compromised in a widely distributed UPnP NAT injection campaign. Currently, the 45,113 routers with confirmed injections expose a total of 1.7 million unique machines to the attackers. It is difficult to tell if these attempts led to a successful exposure as we dont know if a machine was assigned that IP at the time of the injection.”]
Source: https://gbhackers.com/upnproxy-dubbed-nsa-hacking-tool/