As widely reported, many home network routers have BADLY BROKEN security, allowing any external attacker to take over the router and perform nefarious acts in your network.
of GRC.com created a super easy way for you to test your network.
Here, I show a simple video walk-through. EVERYONE should do this as soon as possible. If your network is exposed, fix your router settings or replace it, then try again. Serious business, people.