With his thoughtful suggestion Jim Hamm forwards an interesting site. He starts off, "Here is a description and test to see whether your router may be vulnerable to a UPnP discovery request. I ran the test, and our router is not vulnerable.
And this is the latest addition from Jim, "Here is more information on the Universal Plug and Play (UPnP) vulnerability issue. Although this article came out a while back, I guess reading it now is better late than never."