When i first switched ISP to Solcon i found 2 vulnerability in their Default router settings.
The first one, Default router usernames/passwords.
The second one, Voip Details embedded in the router's webpage source,
on a specific page.

In theory this could have been abused to call Pay phonenumbers to make some easy cash..
All in all the script i made verified this on about 900-1000 routers in their range.
Script was optimized by a friend of mine "Uitklapbare eekhoorn"
They since adjusted the default settings for their routers.
and i got to visit their DataCenter and free internet for a year!