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Vulnerabilities

Vulnerability · CVE-2009-1123

Microsoft Windows Improper Input Validation Vulnerability

Published Jun 10, 2009 · catalog updated Jun 16, 2026 · Microsoft Windows

Patch now

CVE-2009-1123 is in the CISA known-exploited catalog, due Mar 24, 2022. Confirm Microsoft Windows against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
High7.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
4.88%
Remediation
Remediation guidance
Affected products
cpe microsoft/windows 2000 · cpe microsoft/windows server 2003 · cpe microsoft/windows server 2008 · cpe microsoft/windows vista · cpe microsoft/windows xp · vendor Microsoft Windows

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."

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/windows 2000version unspecified
  • cpe microsoft/windows server 2003version unspecified
  • cpe microsoft/windows server 2008version unspecified
  • cpe microsoft/windows vistaversion unspecified
  • cpe microsoft/windows xpversion unspecified
  • vendor Microsoft Windowsversion unspecified
  • vendor n/a n/aversion unspecified

How to fix CVE-2009-1123

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2009-1123 is in the CISA known-exploited catalog, due Mar 24, 2022. Confirm Microsoft Windows against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply updates per vendor instructions.

What should an analyst verify?

CWE-20: Improper Input Validation. EPSS 4.88%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Windows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 10, 2009 · Catalog

    Detected

    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."

  2. Mar 3, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Mar 24, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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."

Sources

  • CISA KEVConfirmed exploitationCVE-2009-1123

    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.

    cisa.gov
  • CVE.orgVulnerability recordCVE-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 De

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2009-1123

    30-day exploitation probability 4.9%

    first.org
  • NIST NVDVulnerability recordCVE-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 De

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2009-1123

    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.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.