Telindus 1100 series ADSL router allows remote attackers to gain privileges to the device via a certain packet to UDP port 9833, which generates a reply that includes the router's password and other sensitive information in cleartext.
http://www.iss.net/security_center/static/9277.php
http://archives.neohapsis.com/archives/bugtraq/2002-06/0028.html