This indicates an attack attempt to exploit an Information Spoofing vulnerability in Microsoft Windows DNS Server.
The vulnerability is caused by a design error when the software is handling a crafted DNS request.
Microsoft Windows 2000 Server Service Pack 4
Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition and Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 with SP1 for Itanium-based Systems and Windows Server 2003 with SP2 for Itanium-based Systems
Windows Server 2008 for 32-bit Systems
Windows Server 2008 for x64-based Systems
Information Spoofing: Remote attackers can spoof the data of vulnerable systems.
Apply the patch, available from the Web site.