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
- 78.14% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- 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
EPSS 78.1% since 30 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.