Backdoor
From Battlestar Wiki, the free, open content Battlestar Galactica encyclopedia and episode guide
A backdoor, in computer information technology, is a programmed exploit that permits remote access into a computer system, usually at a level of total control. In the case of the Command Navigation Program devised by Gaius Baltar, there were backdoors that permitted the Cylons to remotely deactivate ships, allowing them an easy victory against their human enemy.
Additional Information: "Backdoor" Wikipedia Entry