CVE-2009-1123: Microsoft Windows Improper Input Validation Vulnerability

High severity, CVSS 7.8. Actively exploited: in CISA KEV since 2022-03-03. EPSS: 4.9% chance of exploitation in the next 30 days.

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."

Affected products

• Microsoft Windows 2000: affected versions not specified
• Microsoft Windows Server 2003: affected versions not specified
• Microsoft Windows Server 2008: affected versions not specified
• Microsoft Windows Vista: affected versions not specified
• Microsoft Windows XP: affected versions not specified

Published 2009-06-10. Last modified 2026-06-16.