TidBITS:

Don’t panic about the new Wi-Fi security problem that you’ve likely seen trumpeted on news sites. Yes, the KRACK exploits reveal a fundamental flaw in the process by which a Wi-Fi device — like a Mac, iPhone, Windows computer, point-of-sale terminal, or smart fridge — connects securely to a Wi-Fi access point. You shouldn’t underestimate how significant that is (it’s huge), but also don’t overestimate how likely it is to affect you (very unlikely).

Make no mistake – this is very bad. But it’s not as catastrophic as some make it out to be.