Unspecified vulnerability in the TrueType font parsing engine in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3,
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Fix
- Fixed in KB2639417
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
Microsoft Windows operating systems are affected through the TrueType font parsing engine in the win32k.sys kernel-mode driver. A remote attacker could run arbitrary code on a system by using crafted font data in a Word document or web page.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
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."
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- Record last updated
- CISA remediation deadline
Due date for US federal agencies to patch
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
Affected versions
- n/a n/a
Version range not reported
References 20
secunia.com
oval.cisecurity.org
us-cert.gov
securitytracker.com
docs.microsoft.com
symantec.com
securelist.com
technet.microsoft.com
isc.sans.edu
Questions about CVE-2011-3402
What does this mean?
The bug is in how the win32k.sys kernel-mode driver parses TrueType fonts. The advisory says an attacker could use it to run code in kernel mode, then install programs, view, change, or delete data, or create new accounts with full administrative rights.Source: learn.microsoft.com
Am I affected, and how do I check?
The listed affected Windows versions include Windows XP Service Pack 3, among other editions. Windows Server 2008 and R2 installed with Server Core are affected only by the local elevation of privilege scenario, not the web-based or file sharing scenarios. To check a system, compare its Windows edition and service pack against the affected list.Source: learn.microsoft.com
What should I do about it?
The listed fix is update KB2639417. The source quote for that update refers to the Windows Developer Preview release, so confirm it applies to the installed Windows version before installing it.Source: learn.microsoft.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2025-10-06, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data