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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."
Use Microsoft vendor hub and Windows Server 2003 product page to widen CVE-2011-2005 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2017-7269, CVE-2015-2360 and CVE-2015-2387 for nearby disclosures in the same product family. Additional editorial context is available in Weekly Security Roundup: Navigating the April 2026 Threat Landscape and Critical Framework Exploits.