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 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."

Published: 2009-07-15 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2009-1542 is rated Moderate Risk (63.9/100): CVSS Critical severity, with high exploitation likelihood (EPSS 7.98%, 94th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2009-1542

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 18.00% 7.98% -10.02%
2 2025-12-04 18.62% 18.00% -0.62%
3 2025-03-30 — 18.62% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2009-1542

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.0 2.0 HIGH
AV:N/AC:L/Au:S/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.0 10.0 [email protected]

Weakness enumeration for CVE-2009-1542

Affected software / configurations for CVE-2009-1542

Vendor Product Version Raw CPE
microsoft virtual_pc 2004 cpe:2.3:a:microsoft:virtual_pc:2004:sp1:*:*:*:*:*:*
microsoft virtual_pc 2007 cpe:2.3:a:microsoft:virtual_pc:2007:*:*:*:*:*:*:*
microsoft virtual_pc 2007 cpe:2.3:a:microsoft:virtual_pc:2007:*:x64:*:*:*:*:*
microsoft virtual_pc 2007 cpe:2.3:a:microsoft:virtual_pc:2007:sp1:*:*:*:*:*:*
microsoft virtual_server 2005 cpe:2.3:a:microsoft:virtual_server:2005:r2_sp1:*:*:*:*:*:*
microsoft virtual_server 2005 cpe:2.3:a:microsoft:virtual_server:2005:r2_sp1:x64:*:*:*:*:*

References for CVE-2009-1542

cvelogic Threat Intelligence