CVE-2009-1542: Microsoft Virtual Pc

High severity, CVSS 9.0. EPSS: 8% chance of exploitation in the next 30 days.

The Virtual Machine Monitor (VMM) in Microsoft Virtual PC 2004 SP1, 2007, and 2007 SP1, and Microsoft Virtual Server 2005 R2 SP1, does not enforce CPU privilege-level requirements for all machine instructions, which allows guest OS users to execute arbitrary kernel-mode code and gain privileges within the guest OS via a crafted application, aka "Virtual PC and Virtual Server Privileged Instruction Decoding Vulnerability."

Affected products

• Microsoft Virtual Pc: version 2004 only; version 2007 only
• Microsoft Virtual Server: version 2005 only

Published 2009-07-15. Last modified 2026-06-16.