CVE-2007-0948: Undefined Security Weakness

Heap-based buffer overflow in Microsoft Virtual PC 2004 and PC for Mac 7.1 and 7, and Virtual Server 2005 and 2005 R2, allows local guest OS administrators to execute arbitrary code on the host OS via unspecified vectors related to "interaction and initialization of components."...

Virtual Server 2005 Standard English

...

Security Update for Microsoft Virtual Server 2005 (KB969856)

A security issue has been identified that could allow elevation of privilege on virtual machines. You can help protect your computer by installing this update from Microsoft. After you install this item, you need to restart your computer...