CVE-2008-1261
The Zyxel P-2602HW-D1A router with 3.40(AJZ.1) firmware provides different responses to admin page requests depending on whether a user is logged in, which allows remote attackers to obtain current login status by requesting an arbitrary admin URI.
Date published : 2008-03-10
http://www.securityfocus.com/archive/1/489009/100/0/threaded
http://www.gnucitizen.org/projects/router-hacking-challenge/