If you own an Asus router, like the RT-N56U, N66U, or AC68U, you should update your firmware immediately to prevent attackers from accessing USB storage devices attached to your router.
But if you own an Asus router, why would you be running the stock firmware in the first place? It’s 2014 and your router should be working for you, not being crappy like a router from the 1990s. Here are some useful resources: