Known exploited vulnerability
CVE-2011-3402
The short answer
CVE-2011-3402 affects n/a n/a and is rated high (CVSS 8.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-10-06: attackers are using it, so patch it first.
What it is
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."
Severity
8.8 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Oct 6, 2025
Federal due date Oct 27, 2025
EPSS, next 30 days
78%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
n/a. NVD's record lists the exact affected versions.
References
- docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-087 Vendor Advisory
- docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-034 Vendor Advisory
- docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-039 Vendor Advisory
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13998 Broken Link
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15290 Broken Link
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15645 Broken Link
- docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-087 Vendor Advisory
- docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-034 Vendor Advisory
- docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-039 Vendor Advisory
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13998 Broken Link
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15290 Broken Link
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15645 Broken Link
Questions
Is CVE-2011-3402 being exploited?
Yes. CISA added CVE-2011-3402 to its Known Exploited Vulnerabilities catalog on 2025-10-06, with a federal remediation due date of 2025-10-27.
How do I fix CVE-2011-3402?
CISA's required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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