How severe is CVE-2011-2005?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2011-2005 known to be exploited?

Yes. CVE-2011-2005 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-28), indicating it is being actively exploited. 20 public proof-of-concept repositories are indexed.

Vulnerability in Microsoft Windows Server 2003

CVE-2011-2005

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."

Published 2011-10-12 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.318 (98.3th percentile), scored 2026-10-18.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.315 · newest: 0.318 · change: +0.002

Affected products

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-03-28. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-04-18.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

oval.cisecurity.org/repository/search/definition/oval:org.mitre.oval:def:13114 (Broken Link, signature, vdb-entry)
docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-080 (vendor-advisory, Patch, Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2011-2005?: CVE-2011-2005 is a high-severity vulnerability in Microsoft Windows Server 2003. CVSS score: 7.8/10. Published 2011-10-12.
How severe is CVE-2011-2005?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2011-2005 known to be exploited?: Yes. CVE-2011-2005 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-28), indicating it is being actively exploited. 20 public proof-of-concept repositories are indexed.