A group of embedded device hackers has turned up a vulnerability in D-Link consumer-level devices that provides unauthenticated access to the units' admin interfaces.
The flaw means an attacker could take over all of the user-controllable functions of the popular home routers, which includes the DIR-100, DI-524, DI-524UP, DI-604S, DI-604UP, DI-604+ and TM-G5240 units.
More information here http://www.theregister.co.uk/2013/10/13/dlink_routers_have_admin_backdoor/