CVE-2009-1123Actively exploitedAdded to KEV 2022-03-03

Microsoft Windows Improper Input Validation Vulnerability

Microsoft, Windows

Description

The kernel in Microsoft Windows does not properly validate changes to unspecified kernel objects, which allows local users to gain privileges via a crafted application.

CVSS severity for this advisory hasn't been enriched from NVD yet, check back shortly.

EPSS, exploit probability

Medium

4.9%

estimated chance of real-world exploitation in the next 30 days, higher than 92.0% of every CVE FIRST.org scores

Refreshed 10/28/2026, via FIRST.org's EPSS model, not CVSS, this measures likelihood of exploitation, not how severe it would be.

Required action

Apply updates per vendor instructions.

CISA-recommended due date: 2022-03-24

CWE-20

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