You could log into any OS X machine by just pressing enter at the login screen enough times, for over a decade. Apple has trash security and they've stopped even saying what their security updates fix.
1. That wasn't a bug for "over a decade," as far as I'm aware. It was only introduced with an OS update
2. I could be wrong here, but it required you to already have created a root user with a blank password, which isn't possible unless you know how to trigger another bug that does it.