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The Twenty Most Critical Internet Security Vulnerabilities (Updated) ~
The Experts Consensus
Version 5.0 October 8, 2004 Copyright (C) 2001-2004, SANS Institute

Four years ago, the SANS Institute and the National Infrastructure
Protection Center (NIPC) at the FBI released a document summarizing the
Ten Most Critical Internet Security Vulnerabilities. Thousands of
organizations used that list, and the expanded Top-20 lists that
followed one, two, and three years later, to prioritize their efforts so
they could close the most dangerous holes first. The vulnerable services
that led to worms like Blaster, Slammer, and Code Red, as well as NIMDA
worms - are on that list.

http://www.sans.org/top20/