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

> CVE-2009-1123: Microsoft Windows Improper Input Validation Vulnerability. CVSS 7.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2009-1123
Last updated: 2025-10-22T00:05:54Z

- Published: 2009-06-10 18:00 UTC · Updated: 2025-10-22 00:05 UTC · Assigner: microsoft
- CVSS: 7.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS: 4.9%, 92th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-03-03, federal due date 2022-03-24, ransomware use: Unknown

## 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."

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Microsoft: Windows

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2009-1123)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2009-1123)
- [http://osvdb.org/54940](http://osvdb.org/54940)
- [https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-025](https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-025)
- [http://secunia.com/advisories/35372](http://secunia.com/advisories/35372)
- [https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6206](https://oval.cisecurity.org/repository/search/definition/oval%253Aorg.mitre.oval%253Adef%253A6206)
- [http://www.securitytracker.com/id?1022359](http://www.securitytracker.com/id?1022359)
- [http://www.us-cert.gov/cas/techalerts/TA09-160A.html](http://www.us-cert.gov/cas/techalerts/TA09-160A.html)
- [http://www.vupen.com/english/advisories/2009/1544](http://www.vupen.com/english/advisories/2009/1544)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2009-1123 · Markdown: https://rewindex.com/cve/CVE-2009-1123.md · JSON: https://rewindex.com/api/v1/cves/CVE-2009-1123 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:09:26.755Z