CVE-2011-3402
Microsoft Windows Remote Code Execution Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 27 October 2025). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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."
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 78.29% probability · 100th percentile
- CISA KEV
- Listed 6 October 2025 · due 27 October 2025
- Affected
- microsoft/windows 7 · microsoft/windows server 2003 · microsoft/windows server 2008 · microsoft/windows vista · microsoft/windows xp
- Source
- secure@microsoft.com
CISA notes
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-087 ; https://nvd.nist.gov/vuln/detail/CVE-2011-3402
References
- http://blogs.mcafee.com/mcafee-labs/the-day-of-the-golden-jackal-%E2%80%93-further-tales-of-the-stuxnet-filesBroken Link
- http://blogs.technet.com/b/msrc/archive/2011/11/03/microsoft-releases-security-advisory-2639658.aspxVendor Advisory
- http://isc.sans.edu/diary/Duqu+Mitigation/11950Third Party Advisory
- http://secunia.com/advisories/49121Vendor Advisory
- http://secunia.com/advisories/49122Vendor Advisory
- http://technet.microsoft.com/security/advisory/2639658Vendor Advisory
- http://www.securelist.com/en/blog/208193197/The_Mystery_of_Duqu_Part_TwoNot Applicable
- http://www.securitytracker.com/id?1027039Broken Link
- http://www.symantec.com/connect/w32-duqu_status-updates_installer-zero-day-exploitNot Applicable
- http://www.symantec.com/content/en/us/enterprise/media/security_response/whitepapers/w32_duqu_the_precursor_to_the_next_stuxnet.pdfNot Applicable
- http://www.us-cert.gov/cas/techalerts/TA11-347A.htmlUS Government Resource
- http://www.us-cert.gov/cas/techalerts/TA12-129A.htmlUS Government Resource
- http://www.us-cert.gov/cas/techalerts/TA12-164A.htmlUS Government Resource
- http://www.us-cert.gov/control_systems/pdf/ICS-ALERT-11-291-01E.pdfUS Government Resource
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-087Vendor Advisory
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-034Vendor Advisory
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-039Vendor Advisory
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13998Broken Link
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15290Broken Link
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15645Broken Link
- http://blogs.mcafee.com/mcafee-labs/the-day-of-the-golden-jackal-%E2%80%93-further-tales-of-the-stuxnet-filesBroken Link
- http://blogs.technet.com/b/msrc/archive/2011/11/03/microsoft-releases-security-advisory-2639658.aspxVendor Advisory
- http://isc.sans.edu/diary/Duqu+Mitigation/11950Third Party Advisory
- http://secunia.com/advisories/49121Vendor Advisory
- http://secunia.com/advisories/49122Vendor Advisory
- http://technet.microsoft.com/security/advisory/2639658Vendor Advisory
- http://www.securelist.com/en/blog/208193197/The_Mystery_of_Duqu_Part_TwoNot Applicable
- http://www.securitytracker.com/id?1027039Broken Link
- http://www.symantec.com/connect/w32-duqu_status-updates_installer-zero-day-exploitNot Applicable
- http://www.symantec.com/content/en/us/enterprise/media/security_response/whitepapers/w32_duqu_the_precursor_to_the_next_stuxnet.pdfNot Applicable
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.