This was the thing that immediately leapt out at me as well, though I imagine you wouldn't just leave The Machine to manage things forever more, you'd use it as

This was the thing that immediately leapt out at me as well, though I imagine you wouldn't just leave The Machine to manage things forever more, you'd use it as a first responder and then analyse and patch the vulnerability properly. The idea of a self-patching machine going on forever and building up cruft would make a good premise for a story though :)