How severe is CVE-2009-1123?

CVE-2009-1123 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2009-1123 being actively exploited?

Yes. CVE-2009-1123 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-03-03, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2009-1123?

CVE-2009-1123 primarily affects Microsoft Windows 2000. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-1123?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2009-1123 have an EU (EUVD) identifier?

Yes. CVE-2009-1123 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2009-1124. It is also flagged as exploited in the EUVD (since 2022-03-03).

When was CVE-2009-1123 published?

CVE-2009-1123 was published on 2009-06-10 and last updated on 2026-06-16.

CVE-2009-1123

CVE-2009-1123 is a high-severity vulnerability in Microsoft Windows 2000 with a CVSS 3.x base score of 7.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-03-03).

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 7.2
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Yes — listed in CISA KEV (added 2022-03-03)
EU (EUVD) id: EUVD-2009-1124
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-03-03)
Affected product: Microsoft Windows 2000
Published: 2009-06-10
Last modified: 2026-06-16

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."

Frequently asked questions

What is CVE-2009-1123?: 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."
How severe is CVE-2009-1123?: CVE-2009-1123 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2009-1123 being actively exploited?: Yes. CVE-2009-1123 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-03-03, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2009-1123?: CVE-2009-1123 primarily affects Microsoft Windows 2000. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-1123?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2009-1123 have an EU (EUVD) identifier?: Yes. CVE-2009-1123 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2009-1124. It is also flagged as exploited in the EUVD (since 2022-03-03).
When was CVE-2009-1123 published?: CVE-2009-1123 was published on 2009-06-10 and last updated on 2026-06-16.

References

Affected products (8)

cpe:2.3:o:microsoft:windows_2000:-:sp4:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2003:-:sp2:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_vista:-:sp1:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_vista:-:sp2:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:-:sp2:*:*:-:*:*:*
cpe:2.3:o:microsoft:windows_xp:-:sp2:*:*:professional:*:*:*
cpe:2.3:o:microsoft:windows_xp:-:sp3:*:*:*:*:*:*

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