CVE-2011-2005

Microsoft Ancillary Function Driver (afd.sys) Improper Input Validation

7.8 HIGHActively exploited (CISA KEV)EPSS 31.5%

Published12 Oct 2011
Added to CISA KEV28 Mar 2022
Remediation due18 Apr 2022

Description

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 breakdown

Attack vectorLocal

Attack complexityLow

Privileges requiredNone

User interactionRequired

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Affected products

Microsoft Windows Server 2003all versions

Microsoft Windows Xpall versions

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

Patch & vendor advisories

https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-080

References

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

Frequently asked

Is CVE-2011-2005 being actively exploited?

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

How severe is CVE-2011-2005?

CVE-2011-2005 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 31.5% probability of exploitation.

Which products are affected by CVE-2011-2005?

Affected products include Microsoft Windows Server 2003, Microsoft Windows Xp.

How do I fix CVE-2011-2005?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2011-2005 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.