https://duo.com/blog/out-of-box-exploitation-a-security-anal...
e.g. http://teletext.zaibatsutel.net/post/145370716258/deadupdate...
But you're totally fine that THESE are the people with unfetted power to fill your system with backdoors? (Not to mention NSA etc who'd almost certainly have access).
What's wrong with you having zero care about the world's data security?