The telnet service in LevelOne WBR-3460 4-Port ADSL 2/2+ Wireless Modem Router with firmware 1.00.11 and 1.00.12 does not require authentication, which allows remote attackers on the local or wireless network to obtain administrative access.
http://www.securitytracker.com/id?1019162
http://www.securityfocus.com/bid/27183
http://www.securityfocus.com/archive/1/485935/100/0/threaded