CVE-2011-3402highunder attack

CVE-2011-3402

Published · Updated

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88Vexday Risk Score

Patch now. It under exploitation confirmed by CISA and has a working public exploit.

ssvc Actcvss 8.8epss 78%
from disclosure to weapon
Published on NVDNov 4
CISA KEV+5085d
Action required by CISAfederal deadline: 2025-10-27

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

In short

A flaw in how Windows processes TrueType fonts allows attackers to run malicious code by embedding crafted font data in documents or web pages. This was actively exploited by the Duqu malware in the wild.

Technical detail

The vulnerability exists in the kernel-mode TrueType font parsing engine (win32k.sys) and permits remote code execution when a user opens a specially crafted document or visits a malicious webpage containing malformed font data. Attack vectors include Office documents and web browsers; no user privileges are required beyond opening the file.

Summary generated and translated by AI from the official description.

The full analysis of this CVE is available in Portuguese →

Unspecified vulnerability in the TrueType font parsing engine in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 allows remote attackers to execute arbitrary code via crafted font data in a Word document or web page, as exploited in the wild in November 2011 by Duqu, aka "TrueType Font Parsing Vulnerability."
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected products
n/a · n/a