iDEFENSE Security Advisory 11.19.02a – Linksys Cable/DSL Routers models BEFW11S4, BEFSR11, BEFSR41 and BEFSRU31 can be crashed when several thousand characters are passed in the password field of the device’s web management interface. Exploitation simply requires the use of a web browser that can send long Basic Authentication fields to the affected router’s interface. Fix available here.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/30506/11.19.02a.txt
Source: https://packetstormsecurity.com/files/30506/11.19.02a.txt.html