Ladies and Gentlemen, Rogue One has found its exhaust port. It’s not the one attached to the Death Star, of course—that has to be saved for A New Hope. But now we know a little more about the base the Rebels will have to assault in the new movie, and just how simple it is for them to exploit.
Source: io9 – Why Can’t the Empire Design Things Without One Very Obvious Exploitable Flaw?