CVE-2009-1123

Name: CVE-2009-1123
Creator: NVD / NIST
Published: 2009-06-10T18:30:00.327+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10Actively ExploitedEPSS 4.92%

Last modified Jun 16, 2026

CVE-2009-1123 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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 has confirmed active exploitation in the wild. EPSS estimates a 4.92% chance of exploitation in the next 30 days.

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

7.8/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

4.92%

91.0th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Mar 24, 2022.

Affected Software

Vendor	Product	Versions	Update
Microsoft	Windows 2000	All versions	Sp4
Microsoft	Windows Server 2003	All versions	Sp2
Microsoft	Windows Server 2008	All versions	Sp2
Microsoft	Windows Vista	All versions	Sp1
Microsoft	Windows Xp	All versions	Sp2

References

http://osvdb.org/54940Broken Link
http://secunia.com/advisories/35372Broken Link
http://www.securitytracker.com/id?1022359Broken Link, Third Party Advisory, VDB Entry
http://www.us-cert.gov/cas/techalerts/TA09-160A.htmlBroken Link, Third Party Advisory, US Government Resource
http://www.vupen.com/english/advisories/2009/1544Broken Link
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-025Patch, Vendor Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6206Broken Link
http://osvdb.org/54940Broken Link
http://secunia.com/advisories/35372Broken Link
http://www.securitytracker.com/id?1022359Broken Link, Third Party Advisory, VDB Entry
http://www.us-cert.gov/cas/techalerts/TA09-160A.htmlBroken Link, Third Party Advisory, US Government Resource
http://www.vupen.com/english/advisories/2009/1544Broken Link
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-025Patch, Vendor Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6206Broken Link
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-1123US Government Resource

Timeline

Published: Jun 10, 2009
Last Modified: Jun 16, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2009-1123?

How severe is CVE-2009-1123?

CVE-2009-1123 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 4.92% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2009-1123?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2009-1123?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST