One of the models with the vulnerability

The Register reports that a vulnerability has been discovered in several home and small business router models made by D-Link. The vulnerability allows unauthenticated users to gain administrative access to the router’s Web interface, thereby providing access to the network behind the router.  Per the post, models include DIR-100, DI-524, DI-524UP, DI-604S, DI-604UP, DI-604+ and TM-G5240 units.

Because there is no current fix, users should disable admin access via wireless connection.