Bash is like the command prompt for Mac and Linux computers. Over 50% of web servers run some variant of Linux so they'll be at risk although some variants already released patches to fix the bug. Apple itself hasn't released a patch yet, probably incoming.
As for home appliances, they are all also at risk, and it's kinda uncommon to see software updates or patches for those so who knows what will happen lol.
But yeah, unless you're a sysadmin dealing with web servers or if you have these kind of home appliances you shouldn't be worried. Even if you have a Linux/Mac computer; patch it when the update comes out for sure; but nobody can take over your computer most probably because your firewall will stop it. Only "server" type devices which take requests from other devices are at risk. To use Hessah's example of a light, the iPad would be the client sending a request and the light would be the server taking the request. Your iPad itself isn't normally configured to take requests so unless somebody has your iPad with them they wouldn't be able to exploit this bug. Of course if they had it with them they wouldn't need to go through this bug and would just do whatever they wanted.
