CVE-2011-3402
HighExploitedPublic exploitUnspecified 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…
Published Nov 4, 2011 · Updated Apr 22, 2026
Key Facts
Patch immediately- CVE-2011-3402 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Windows 7 (Microsoft), Windows Server 2003 (Microsoft), Windows Server 2008 (Microsoft) and 2 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 4, 2011 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 78% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
78%
Higher than 99.5% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2011-3402 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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."
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Oct 6, 2025 | Oct 27, 2025 | Not reported |
| Industry KEV feed | Nov 4, 2011 | Oct 27, 2025 | Known |
| CIRCL KEV | Nov 4, 2011 | Oct 27, 2025 | Not reported |
| ENISA EUVD | Oct 6, 2025 | n/a | Not reported |
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.
Affected Products
9 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 7Microsoft | See advisory | n/a |
| Windows Server 2003Microsoft | See advisory | n/a |
| Windows Server 2008Microsoft | See advisory | n/a |
| Windows VistaMicrosoft | See advisory | n/a |
| Windows XpMicrosoft | See advisory | n/a |
Timeline
Publicly disclosed
Nov 4, 2011
Added to Industry KEV feed
Nov 4, 2011
Added to CIRCL KEV
Nov 4, 2011
Added to CISA KEV
Oct 6, 2025
Added to ENISA EUVD
Oct 6, 2025
Last updated
Apr 22, 2026
References
- advisoryhttp://blogs.technet.com/b/msrc/archive/2011/11/03/microsoft-releases-security-advisory-2639658.aspx
- advisoryhttp://isc.sans.edu/diary/Duqu+Mitigation/11950
- advisoryMS11-087
- advisoryMS12-034
- advisoryMS12-039
FAQ
Common Questions.
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…
Affected: Windows 7 (Microsoft); Windows Server 2003 (Microsoft); Windows Server 2008 (Microsoft), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 4, 2011 and is known to be used in ransomware campaigns.
Yes. It was added on Oct 6, 2025 with a federal remediation due date of Oct 27, 2025.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2011-3402 Running On Your Attack Surface?
Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.
Request A Demo