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CVE-2011-3402: Microsoft Windows Remote Code Execution Vulnerability

criticalknown exploitedpublic exploitCVE-2011-3402
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.
Microsoft Windows Kernel contains an unspecified vulnerability in the TrueType font parsing engine in win32k.sys in the kernel-mode drivers that allows remote attackers to execute arbitrary code via crafted font data in a Word document or web page.

CSIRTS triage

vendor: Microsoftproduct: WindowsRemote code execution
What
The vulnerability allows remote attackers to execute arbitrary code via crafted font data.
Who is affected
Deployments of Microsoft Windows with the affected kernel-mode drivers.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Apply the latest security updates from Microsoft.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-10-06
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2011-3402

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-2011-3402coverage & exploitation statusNVD · CVE.org

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