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A vulnerability has been discovered in the Domain Name System (DNS) Server service in Microsoft Windows 2000 Server Service Pack 4 (SP4), in Microsoft Windows Server 2003 Service Pack 1 (SP1), and in Windows Server 2003 Service Pack 2 (SP2). Windows 2000 Professional SP4, Microsoft Windows XP SP2, and Windows Vista are not affected because these versions of Windows do not contain the vulnerable code. Microsoft has released a Microsoft Security Advisory about this issue for IT professionals. This security advisory also contains additional security-related information. To view this security advisory, visit the following Microsoft Web site: