TrueType Font Parsing Vulnerability in Microsoft Windows win32k.sys
CVE-2011-3402 is a remote code execution vulnerability in the TrueType font parsing engine of Microsoft Windows, specifically in win32k.sys within the kernel-mode drivers. The flaw is triggered when Windows improperly handles specially crafted TrueType font data. An attacker can deliver the malicious font through an embedded font in a Microsoft Word document or through a web page that embeds TrueType fonts. Successful exploitation results in execution of attacker-controlled code in kernel mode. The vulnerability was publicly disclosed and exploited in limited targeted attacks in the wild, including attacks associated with Duqu. Microsoft addressed the issue in MS11-087 / KB2639417 by modifying how the Windows kernel-mode driver handles TrueType font files.
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Impact, mitigation & remediation
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
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Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Windows kernel (win32k.sys) TrueType font parsing remote code execution vulnerability triggered via malicious font files in documents or web pages.
A critical remote code execution vulnerability in the Windows kernel-mode driver caused by improper handling of specially crafted TrueType font files.
A specific vulnerability used by multiple exploit kits according to the table.
Earlier Windows TrueType Font (TTF) vulnerability referenced as a prior similar issue that was adapted by exploit kits for browser-based exploitation.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.