Convicted hacker reveals how he hacked 15 telecom companies.

Robert Moore, a convicted hacker, planned to hijack the networks of 15 telecom companies, and sell them through a different company. To achieve this, he hacked into the routers. He recently revealed how easy it was, and he said that even a cave man can do it. It is really astonishing to know that a lot of routers have the password cisco0!!
http://www.secumania.org/news/security/interview-with-a-convicted-hacker:-robert-moore-tells-how-he-broke-into-routers-and-stole-voip-services-2007092632041/
http://www.informationweek.com/news/showArticle.jhtml?articleID=202101781