@Stoori it probably doesn't affect your device (unless you host a java server on your home computer) but it probably DOES affect nearly every website you have an account with. (well, it might affect certain “smart” devices, but i don’t have good guidance there.)

this is a big deal because it has existed for a long time, is widely distributed (apple, instagram, twitter, most storefronts…), and may be difficult to track down. if a service is compromised, that could mean your personal information has been exposed, so just stay vigilant.