The 18 scariest computer viruses of all time

Sasser (2004)

In April 2004, Microsoft issued a patch for a vulnerability in Windows' Local Security Authority Subsystem Service (LSASS). Shortly after, a teenager in Germany released the Sasser worm to exploit the vulnerability in unpatched machines. Multiple variants of Sasser took out airline, public transportation, and hospital networks, causing $18 billion in damages.

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By Fox Van Allen

Fox Van Allen is a Los Angeles-based writer for CBS Interactive covering technology, tech lifestyle and gaming topics for GameSpot, CNET, ZDNet and TechRepublic. He has previously worked as a news and feature writer for a number of other sites, inclu...