How severe is CVE-2011-3402?

CVE-2011-3402 has a CVSS score of 8.8/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2011-3402?

Affected package information for CVE-2011-3402 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2011-3402?

No fixed version has been published for CVE-2011-3402 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2011-3402 actively exploited in the wild?

Yes. There are 2 known exploit references for CVE-2011-3402, including 2 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2011-3402?

CVE-2011-3402 has an EPSS (Exploit Prediction Scoring System) score of 88.3%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2011-3402 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2011-3402 (Microsoft Windows Remote Code Execution Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2025-10-06. CISA required all US federal civilian agencies to remediate this vulnerability by 2025-10-27. The required action was: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

Which products and versions are affected by CVE-2011-3402?

CVE-2011-3402 affects microsoft windows 7; microsoft windows server 2003; microsoft windows server 2008; microsoft windows vista, and 1 more product(s). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2011-3402 published, and has it been updated?

CVE-2011-3402 was published on November 4, 2011 and was last updated on April 22, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2025-10-06 — agencies required to remediate by 2025-10-27

CVE-2011-3402

HIGH

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,…

Published

Nov 4, 2011

Updated

Apr 22, 2026

Affected

0 pkgs

Patched

None yet

Exploits

2 known

EPSS Exploitation Probability

via FIRST.org ↗

88.3%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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 Products

5 products · 9 configurations

windows 7microsoft

all

windows server 2003microsoft

all

windows server 2008microsoft

all

windows vistamicrosoft

all

windows xpmicrosoft

all

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Unspecified vulnerability in the TrueType font parsing engine in win32k.…

github.comMetasploitSep 2020

Unspecified vulnerability in the TrueType font parsing engine in win32k.…

nvd.nist.govNVDSep 2020

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2011-3402 in your stack?

O3 detects CVE-2011-3402 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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