CVE-2011-2005: Microsoft Ancillary Function Driver (afd.sys) Improper Input Validation Vulnerability
Reference page built from the source records below, each shown as its source publishes it. Dataset version ref-f142c3cdbb95, updated 2026-11-02T23:39:54.475Z.
CISA Known Exploited Vulnerabilities
- Name
- Microsoft Ancillary Function Driver (afd.sys) Improper Input Validation Vulnerability
- Vendor
- Microsoft
- Product
- Ancillary Function Driver (afd.sys)
- Added to the catalog
- 2022-03-28
- Due date for US federal agencies
- 2022-04-18
- Weaknesses
- CWE-264
- Catalog version
- 2026.10.30
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.
Required action (CISA)
Apply updates per vendor instructions.
Ransomware use: CISA does not mark known use of this vulnerability in ransomware campaigns.
Links in CISA's notes
Read on 2026-11-02T23:39:54.475Z under licence cisa-kev-cc0@b0067899 from https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
NVD analysis
- Status
- Analyzed
- Published
- 2011-10-12T02:52:43.910
- Last modified
- 2026-06-16T23:30:35.373
- Weaknesses
- NVD-CWE-noinfo
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."
| Metric | Score | Severity | Vector | Scored by |
|---|---|---|---|---|
| CVSS 3.1 | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H | [email protected] (Primary) |
| CVSS 3.1 | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H | 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary) |
| CVSS 2.0 | 7.2 | HIGH | AV:L/AC:L/Au:N/C:C/I:C/A:C | [email protected] (Primary) |
References
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-080 (Patch, Vendor Advisory)
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13114 (Broken Link)
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-080 (Patch, Vendor Advisory)
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13114 (Broken Link)
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2011-2005 (US Government Resource)
This product uses the NVD API but is not endorsed or certified by the NVD.
Read on 2026-11-02T23:41:28.906Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2011-2005
CVE record
- Assigner
- microsoft
- State
- PUBLISHED
- Published
- 2011-10-12T01:00:00.000Z
- Updated
- 2025-10-22T00:05:49.314Z
- Problem types
- n/a
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."
References
Read on 2026-11-03T00:23:52.083Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2011/2xxx/CVE-2011-2005.json
Sources and licences
CISA
Source: CISA Catalog of Known Exploited Vulnerabilities, version 2026.10.30, CC0 1.0. Use of this data does not imply endorsement by CISA or DHS.
National Vulnerability Database (NIST)
This product uses the NVD API but is not endorsed or certified by the NVD.
NVD API Terms of Use (NIST publications in the public domain, 17 U.S.C. 105)
CVE Program, The MITRE Corporation
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Cite this page
Dragons Eye Ransomware Tracker, "CVE-2011-2005: Microsoft Ancillary Function Driver (afd.sys) Improper Input Validation Vulnerability",
entity page, dataset version ref-f142c3cdbb95, updated 2026-11-02T23:39:54.475Z,
https://ransomware-tracker.com/cve/CVE-2011-2005 (accessed 2026-11-03).
Underlying source: CISA Catalog of Known Exploited Vulnerabilities, version 2026.10.30.
Underlying source: National Vulnerability Database (NIST), CVE API 2.0, record last modified 2026-06-16T23:30:35.373.
Underlying source: CVE List (CVE Program, The MITRE Corporation), record updated 2025-10-22T00:05:49.314Z.
Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.