CVE-2009-1123
High 7.8 Exploited in the wild (KEV)
Confirmed active exploitation — CISA KEV catalog
- Name
- Microsoft Windows Improper Input Validation Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply updates per vendor instructions.
Description
The kernel in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold, SP1, and SP2, and Server 2008 SP2 does not properly validate changes to unspecified kernel objects, which allows local users to gain privileges via a crafted application, aka "Windows Kernel Desktop Vulnerability."
Metrics
- CVSS 3.1
-
7.8 (HIGH)
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 5% (percentile: 92) as of 1 November 2026
Affected products
microsoft: windows 2000; microsoft: windows server 2003; microsoft: windows server 2008; microsoft: windows vista; microsoft: windows xp
References
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-0… PatchVendor Advisory
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-0… PatchVendor Advisory
- http://osvdb.org/54940 Broken Link
- http://secunia.com/advisories/35372 Broken Link
- http://www.securitytracker.com/id?1022359 Broken LinkThird Party AdvisoryVDB Entry
- http://www.us-cert.gov/cas/techalerts/TA09-160A.html Broken LinkThird Party AdvisoryUS Government Resource
- http://www.vupen.com/english/advisories/2009/1544 Broken Link
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%… Broken Link
- http://osvdb.org/54940 Broken Link
- http://secunia.com/advisories/35372 Broken Link