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Vulnerability record · CVE-2012-1866 · published 12 June 2012

CVE-2012-1866: Microsoft windows 2003 server improper input validation vulnerability

Microsoft · Windows 2003 Server

win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 does not properly handle user-mode input passed to kernel mode for driver objects, which allows local users to gain privileges via a crafted application, aka "Clipboard Format Atom Name Handling Vulnerability."

7.2 CVSS 2.0 High EPSS 1.7% · top 23.0% CWE-20 · Improper input validation
7.2CVSS 2.0 base score
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
6References
16 Jun 2026Last modified by NVD

Description

win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 does not properly handle user-mode input passed to kernel mode for driver objects, which allows local users to gain privileges via a crafted application, aka "Clipboard Format Atom Name Handling Vulnerability."

AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.us-cert.gov/cas/techalerts/TA12-164A.html US Government Resource
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-041
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15096
http://www.us-cert.gov/cas/techalerts/TA12-164A.html US Government Resource
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-041
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15096

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2012-1866), CISA KEV, FIRST EPSS (scores of 2026-10-14). This page is refreshed as NVD updates the record.