Here is a taste, this rabbit hole goes deep.Do you have any links for more info on this being a more widespread problem?
https://www.cnet.com/news/top-wi-fi-routers-easy-to-hack-says-study/
http://www.npr.org/2016/10/22/49895...things-hacking-attack-led-to-outage-of-popula
http://thehackernews.com/2016/04/hack-modem-internet.html