This security update resolves a privately reported vulnerability in Microsoft SQL Server. The vulnerability could allow remote code execution if untrusted users access an affected system or if a SQL injection attack occurs to an affected system. Systems with SQL Server 7.0 Service Pack 4, SQL Server 2005 Service Pack 3, and SQL Server 2008 are not affected by this issue.
This security update is rated Important for supported releases of SQL Server 2000, SQL Server 2005 Service Pack 2, Microsoft SQL Server 2000 Desktop Engine (MSDE 2000), SQL Server 2005 Express Edition, Microsoft SQL Server 2000 Desktop Engine (WMSDE), and Windows Internal Database (WYukon). For more information, see the subsection, Affected and Non-Affected Software, in this section.
The article continues at http://www.microsoft.com/technet/security/Bulletin/MS09-004.mspx