CVE-2009-1542

no score yetEPSS 8.0%

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."

EPSS: 8.0% chance of exploitation in the next 30 days; higher than 94% of CVEs (scores of 2026-10-31)
CWE: CWE-264
Published: 2009-07-15
Modified: 2026-06-16
Record from: the NVD, synced 2026-10-19

Affected

microsoft:virtual_pc
microsoft:virtual_server

References

http://secunia.com/advisories/35808
http://www.securitytracker.com/id?1022544
http://www.us-cert.gov/cas/techalerts/TA09-195A.html
http://www.vupen.com/english/advisories/2009/1890
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-033

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