The main way a hacker could do it in some households is social engineering. As the password is (in this case) written on the router then all they have to do is get access to the house (and that isn't particularly unusual if people aren't vigilant - perhaps someone knocks on the door and says they've just fallen off their bike and could they use the phone - you let them in and offer them a drink - whilst you are making a drink they are "using" the phone which in many houses just happens to be next to the router).
Programmes like the Real Hustle show how easy it is to get conned. Personally I would leave no router at the default password for WiFi or the admin interface. Especially BT hubs that helpfully print both passwords on the router and on a handy card that most people probably don't even realise is in the back of the router.
Just yesterday the BBC were doing more coverage about peoples smart devices and how insecure they can be if you don't take the proper precautions.



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ian72