CVE-2011-2005

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

Description

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.

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."

CVSS 3.1 vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

PublishedOct 12, 2011

Last modifiedJun 16, 2026

Added to KEVMar 28, 2022

Remediation dueApr 18, 2022

References

docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-080PatchVendor Advisory
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13114Broken Link
cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2011-2005US Government Resource

0 recent articles mention this CVE

Risk assessment · High

Actively exploited. Patch immediately.

Exploitation: Confirmed in the wild (CISA KEV)
Federal remediation deadline: Overdue by 1652 days
CVSS: 7.8 HIGH
EPSS (30-day exploit probability): 31.8% · top 2% of all CVEs
Weakness: NVD-CWE-noinfo

Recommended actions

1.Apply updates per vendor instructions.
2.Treat as emergency change: patch or isolate internet-facing instances first.
3.Hunt for compromise: review logs for the disclosure window, not just from the patch date.

Assessment is derived automatically from the live signals above; verify against your own asset inventory.