This important security update resolves a privately reported vulnerability in
implementations of Active Directory on Microsoft Windows 2000 Server and
Windows Server 2003 and Active Directory Application Mode (ADAM) when
installed on Windows XP and Windows Server 2003. The vulnerability could
allow a denial of service condition. On Windows Server 2003 and Windows XP
an attacker must have valid logon credentials to exploit this vulnerability. An
attacker who successfully exploited this vulnerability could cause the system
to stop responding or automatically restart.