Is CVE-2009-1123 being actively exploited?

Yes. CVE-2009-1123 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added on March 3, 2022.

What is the CVSS score for CVE-2009-1123?

CVE-2009-1123 has a CVSS 3.1 base score of 7.8 (HIGH).

CVE-2009-1123

HIGH · CVSS 7.8CISA KEV: actively exploitedEPSS 4.9%EU EUVD: exploited

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."

Key facts

CVSS score: 7.8 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS score: 4.9% (92th percentile)
In CISA KEV: Yes, added March 3, 2022
In EU EUVD: Yes (EUVD-2009-1124)
Published: June 10, 2009
NVD last modified: June 16, 2026
Status: Analyzed

CISA Known Exploited Vulnerability

Microsoft Windows Improper Input Validation Vulnerability

Added to the KEV catalog on March 3, 2022; federal remediation due March 24, 2022.

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2009-1124 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on October 22, 2025.

View on the EU Vulnerability Database

Affected products

microsoft / windows 2000
microsoft / windows server 2003
microsoft / windows server 2008
microsoft / windows vista
microsoft / windows vista
microsoft / windows xp
microsoft / windows xp
microsoft / windows xp

Certified products that may be affected

11 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Windows Vista Enhanced Cryptographic Provider (RSAENH) - Microsoft Corporation - FIPS 140 1002 - historical
Windows Vista Enhanced DSS and Diffie-Hellman Cryptographic Provider (DSSENH) - Microsoft Corporation - FIPS 140 1003 - historical
Windows XP Enhanced Cryptographic Provider (RSAENH) - Microsoft Corporation - FIPS 140 989 - historical
Windows XP Enhanced DSS and Diffie-Hellman Cryptographic Provider (DSSENH) - Microsoft Corporation - FIPS 140 990 - historical
Windows Vista Boot Manager (bootmgr) - Microsoft Corporation - FIPS 140 978 - historical

See all 11 in the Security Certifications Explorer.

References

http://osvdb.org/54940(Broken Link)
http://secunia.com/advisories/35372(Broken Link)
http://www.securitytracker.com/id?1022359(Broken Link, Third Party Advisory, VDB Entry)
http://www.us-cert.gov/cas/techalerts/TA09-160A.html(Broken Link, Third Party Advisory, US Government Resource)
http://www.vupen.com/english/advisories/2009/1544(Broken Link)
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-025(Patch, Vendor Advisory)
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6206(Broken Link)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-1123(US Government Resource)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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