Microsoft Ancillary Function Driver (afd.sys) Improper Input Validation Vulnerability

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• cpe microsoft/windows server 2003version unspecified
• cpe microsoft/windows xpversion unspecified
• vendor Microsoft Ancillary Function Driver (afd.sys)version unspecified
• vendor n/a n/aversion unspecified

How to fix CVE-2011-2005

• Recommended remediation

  Apply updates per vendor instructions. CISA due date Apr 18, 2022.

• Official advisories

  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

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

Technology hubs

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. Oct 11, 2011 · Catalog

   Detected

   afd.sys in the Ancillary Function Driver in Microsoft Windows XP SP2 and SP3 and Server 2003 SP2 does not properly validate user-mode input passed to kernel mode, which allows local users to gain privileges via a crafted application, aka "Ancillary Function Driver Elevation of Privilege Vulnerability."

2. Mar 28, 2022 · CISA KEV

   Known exploited

   Apply updates per vendor instructions.

3. Apr 18, 2022 · CISA KEV

   Remediation due

   Apply updates per vendor instructions.

4. Jun 16, 2026 · Catalog

   Updated

   afd.sys in the Ancillary Function Driver in Microsoft Windows XP SP2 and SP3 and Server 2003 SP2 does not properly validate user-mode input passed to kernel mode, which allows local users to gain privileges via a crafted application, aka "Ancillary Function Driver Elevation of Privilege Vulnerability."

Sources

• CISA KEVConfirmed exploitationCVE-2011-2005

  afd.sys in the Ancillary Function Driver in Microsoft Windows does not properly validate user-mode input passed to kernel mode, which allows local users to gain privileges via a crafted application.

  cisa.gov
• CVE.orgVulnerability recordCVE-2011-2005

  afd.sys in the Ancillary Function Driver in Microsoft Windows XP SP2 and SP3 and Server 2003 SP2 does not properly validate user-mode input passed to kernel mode, which allows local users to gain privileges via a crafted application, aka "Ancillary Function Driver Elevation of Pr

  cve.org
• FIRST EPSSExploitation probabilityCVE-2011-2005

  30-day exploitation probability 31.8%

  first.org
• Exploit DatabasePublic exploit reference18176

  Public archive entry. The exploit body is not stored here.

  exploit-db.com
• Exploit DatabasePublic exploit reference21844

  Public archive entry. The exploit body is not stored here.

  exploit-db.com
• Metasploit ModulesPublic exploit moduleexploit_windows/local/ms11_080_afdjoinleaf

  Public module reference (average). Module source is not copied into this catalog.

  rapid7.com
• NIST NVDVulnerability recordCVE-2011-2005

  afd.sys in the Ancillary Function Driver in Microsoft Windows XP SP2 and SP3 and Server 2003 SP2 does not properly validate user-mode input passed to kernel mode, which allows local users to gain privileges via a crafted application, aka "Ancillary Function Driver Elevation of Pr

  nvd.nist.gov
• VulnCheck KEVConfirmed exploitationCVE-2011-2005

  afd.sys in the Ancillary Function Driver in Microsoft Windows does not properly validate user-mode input passed to kernel mode, which allows local users to gain privileges via a crafted application.

  vulncheck.com

References

• Patch · docs.microsoft.com
• CISA note · nvd.nist.gov
• Broken Link · oval.cisecurity.org
• US Government Resource · cisa.gov
• VulnCheck exploitation evidence · cisa.gov
• VulnCheck exploitation evidence · www2.fireeye.com

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.