Microsoft Ancillary Function Driver (afd.sys) Improper Input Validation Vulnerability
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.
- Vendor
- Microsoft
- Product
- Ancillary Function Driver (afd.sys)
- CVSS
- 7.8
- EPSS (exploit probability)
- 31.8%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2011-2005 being exploited?
Yes. CISA added CVE-2011-2005 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 31.8% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-11-13. Full cross-catalog view: /kev-comparison
CVE-2011-2005 timeline
Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON
What to do
CISA required actionApply updates per vendor instructions.
US federal civilian agencies must remediate by (21 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
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| CVE-2026-69843 Microsoft Fabric authentication bypass by spoofingwrite-up | [ CRITICAL ] | 10.0 | 0.9% | — |
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| CVE-2026-81963 Microsoft Windows Update Stack Link-Following Privilege Escalationwrite-up | [ HIGH ] | 7.8 | 7.1% |