CVEs / CVE-2011-3402

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

• Known exploited in the CISA KEV catalog since 6 Oct 2025
• high 8.8 CVSS 3.1 (NVD)
• EPSS 78.1% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
• Last changed at its sources 16 Jun 2026

Summary

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.

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."

Affected and fixed versions

Exploitation

Severity

References

• CVE-2011-3402 on NVD
• CVE-2011-3402 in the CISA KEV catalog
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-087 (cited by CISA)
• http://blogs.mcafee.com/mcafee-labs/the-day-of-the-golden-jackal-%E2%80%93-further-tales-of-the-stuxnet-files Broken Link
• http://blogs.technet.com/b/msrc/archive/2011/11/03/microsoft-releases-security-advisory-2639658.aspx Vendor Advisory
• http://isc.sans.edu/diary/Duqu+Mitigation/11950 Third Party Advisory
• http://secunia.com/advisories/49121 Vendor Advisory
• http://secunia.com/advisories/49122 Vendor Advisory
• http://technet.microsoft.com/security/advisory/2639658 Vendor Advisory
• http://www.securelist.com/en/blog/208193197/The_Mystery_of_Duqu_Part_Two Not Applicable
• http://www.securitytracker.com/id?1027039 Broken Link
• http://www.symantec.com/connect/w32-duqu_status-updates_installer-zero-day-exploit Not Applicable
• http://www.symantec.com/content/en/us/enterprise/media/security_response/whitepapers/w32_duqu_the_precursor_to_the_next_stuxnet.pdf Not Applicable
• http://www.us-cert.gov/cas/techalerts/TA11-347A.html US Government Resource
• http://www.us-cert.gov/cas/techalerts/TA12-129A.html US Government Resource
• http://www.us-cert.gov/cas/techalerts/TA12-164A.html US Government Resource
• http://www.us-cert.gov/control_systems/pdf/ICS-ALERT-11-291-01E.pdf US Government Resource
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-087 Vendor Advisory
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-034 Vendor Advisory
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-039 Vendor Advisory
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13998 Broken Link
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15290 Broken Link
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15645 Broken Link