CVE-2011-2005 — Microsoft Ancillary Function Driver (afd.sys) Improper Input Validation Vulnerability

CVE-2011-2005 (Microsoft Ancillary Function Driver (afd.sys)) is in the CISA Known Exploited Vulnerabilities catalog since 2022-03-28. afd.sys in the Ancillary Function Driver in Microsoft Windows does not properly validate user-mode input… See the required fix, due date and advisories.

Exploitation status

CVE-2011-2005 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2022-03-28. 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.

Advisory facts

Vendor or project
Microsoft
Affected product
Ancillary Function Driver (afd.sys)
Added to CISA KEV
2022-03-28
US federal remediation due date
2022-04-18
Ransomware association
Unknown
EPSS score
—
Weakness (CWE)
CWE-264

Remediation: the required action

Apply updates per vendor instructions.

Wording published by CISA for this catalog entry. It is the baseline action, not a decision about your environment: whether this exposure matters for you depends on where the affected component runs, what it is exposed to and who owns it.

From advisory to a decision you can defend

A catalog entry tells you a vulnerability is being exploited somewhere. It does not tell you whether it matters in your estate, who owns the fix, or what evidence an auditor will ask for later. That is the work VulnTrek does: it takes findings from the tools you already run, decides which exposure actually matters, routes it to an owner, keeps remediation human-approved and retains the lineage as evidence.

Sourced from public upstream advisories (CISA KEV, ENISA EUVD, vendor PSIRTs) mirrored daily. Informational only — not a remediation decision, not legal advice, and the absence of a record is not evidence of safety.