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

criticalknown exploitedpublic exploitCVE-2011-2005
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Microsoftproduct: WindowsPrivilege escalation
What
afd.sys in Microsoft Windows does not properly validate user-mode input, allowing local privilege escalation.
Who is affected
Local users on affected Microsoft Windows systems.
Urgency
Remediation is critical due to active exploitation and high severity.
Action
Install the latest security updates for Windows.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-03-28
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2011-2005

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2011-2005coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Ancillary Function

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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