# CVE-2011-3402: Microsoft Windows Remote Code Execution

> Remote attackers can execute arbitrary code via crafted TrueType font data in documents or web pages, affecting Windows kernel drivers.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Yes, since 6 Oct 2025 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 4 Nov 2011
- **Updated:** 22 Oct 2025
- **Also known as:** GHSA-qv6f-65c9-qp9p

## What is CVE-2011-3402?

CVE-2011-3402 is a high-severity memory corruption vulnerability in Microsoft Windows 7, published on 4 Nov 2011. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official 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."

## Which versions are affected by CVE-2011-3402?

It affects 5 products.


Products: Microsoft Windows 7, Microsoft Windows Server 2003, Microsoft Windows Server 2008, Microsoft Windows Vista, Microsoft Windows Xp.

## How do I fix CVE-2011-3402?

No fix has been published for CVE-2011-3402 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 27 Oct 2025.

## Is CVE-2011-3402 being exploited?

Yes. Attackers have exploited CVE-2011-3402 in the wild since at least 6 Oct 2025.

Public exploit code:

- Windows Gather Forensics Duqu Registry Check (metasploit)

## Other vulnerabilities in Microsoft Windows 7

- [CVE-2015-1635](https://insights.sbomify.com/CVE-2015-1635/): Microsoft HTTP.sys Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2015-2360](https://insights.sbomify.com/CVE-2015-2360/): Microsoft Win32k Privilege Escalation (high 8.8, exploited in the wild)
- [CVE-2014-6324](https://insights.sbomify.com/CVE-2014-6324/): Microsoft Kerberos Key Distribution Center (KDC) Privilege Escalation (high 8.8, exploited in the wild)
- [CVE-2014-6332](https://insights.sbomify.com/CVE-2014-6332/): Microsoft Windows Object Linking & Embedding (OLE) Automation Array Remote Code Execution (high 8.8, exploited in the wild)
- [CVE-2014-4148](https://insights.sbomify.com/CVE-2014-4148/): Microsoft Windows Remote Code Execution (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2011-3402 and fix it if it is affected.

What it is: CVE-2011-3402 is a high-severity memory corruption vulnerability in Microsoft Windows 7, published on 4 Nov 2011. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: Yes. Attackers have exploited CVE-2011-3402 in the wild since at least 6 Oct 2025.

Affected product: Microsoft Windows 7. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2011-3402/ (Markdown: https://insights.sbomify.com/CVE-2011-3402/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2011-3402
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2011-3402
- OSV: https://osv.dev/vulnerability/CVE-2011-3402

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From sbomify Insights: https://insights.sbomify.com/CVE-2011-3402/
Summaries are generated and may contain mistakes; the official description above is the record.