24/01/2003
The SQL slammer worm, or Sapphire worm, Helkern and other names, attacks vulnerabilities in Microsoft SQL Server and MSDE and causes widespread problems on the internet.
The worm caused a denial of service on some internet hosts and dramatically slowed down general Internet traffic, starting at 05:30 UTC on January 25, 2003. It spread rapidly, infecting most of its 75,000 victims within ten minutes.