CVE-2011-2005
High 7.8 Exploited in the wild (KEV)
Confirmed active exploitation — CISA KEV catalog
- Name
- Microsoft Ancillary Function Driver (afd.sys) Improper Input Validation Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply updates per vendor instructions.
Description
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."
Metrics
- CVSS 3.1
-
7.8 (HIGH)
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 32% (percentile: 98) as of 1 November 2026
Affected products
microsoft: windows server 2003; microsoft: windows xp
References
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-0… PatchVendor Advisory
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-0… PatchVendor Advisory
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%… Broken Link
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%… Broken Link
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2011… US Government Resource