CVE-2009-1542
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (7.98%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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."
- CVSS 2.0
- 9.0 HIGHAV:N/AC:L/Au:S/C:C/I:C/A:C
- EPSS
- 7.98% probability · 95th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-264
- Affected
- microsoft/virtual pc · microsoft/virtual server
- Source
- secure@microsoft.com
EPSS 8.0% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://secunia.com/advisories/35808
- http://www.securitytracker.com/id?1022544
- http://www.us-cert.gov/cas/techalerts/TA09-195A.htmlUS Government Resource
- http://www.vupen.com/english/advisories/2009/1890
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-033
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6166
- http://secunia.com/advisories/35808
- http://www.securitytracker.com/id?1022544
- http://www.us-cert.gov/cas/techalerts/TA09-195A.htmlUS Government Resource
- http://www.vupen.com/english/advisories/2009/1890
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-033
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6166
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.