ACTIVELY EXPLOITED
CVE-2011-2005: Microsoft Ancillary Function Driver (afd.sys) Improper Input Validation Vulnerability
| Vendor | Microsoft |
|---|---|
| Product | Ancillary Function Driver (afd.sys) |
| Actively exploited | Yes |
| Added to CISA KEV | 28 Mar 2022 |
| CISA federal deadline | 18 Apr 2022 |
| Weakness (CWE) | CWE-264 |
Required action (CISA's text)
Apply updates per vendor instructions.
Description (NVD)
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.
SOURCES
Other Microsoft flaws
- patchtuesday:2026-11: Vulnerability in Microsoft
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- CVE-2026-96951: Microsoft Windows Command Injection Vulnerability
- CVE-2026-65660: Microsoft SharePoint Code Injection Vulnerability
- CVE-2026-85880: Microsoft Windows Heap-Based Buffer Overflow Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.