[From MySQL]
MySQL AB would like to confirm that the MySQL™ database is not affected by nor is responsible for the recent “Slammer” (also known as “Sapphire”) worm that has caused widespread Internet disruption. This worm attack, which began last Friday, has been linked to a set of known flaws in Microsoft SQL Server, and at this time, it is only known to affect Microsoft SQL Server and certain products that are based on it (such as Microsoft Desktop Engine (MSDE) and Microsoft Office Developer Edition products). Several Internet news sites have erroneously linked MySQL to the Slammer worm.
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http://www.mysql.com/news/article-272.html