# CVE-2010-4398: Microsoft Windows Kernel Stack-Based Buffer Overflow Vulnerability

Source: https://junglewise.ai/threats/cve-2010-4398-microsoft-windows-kernel-stack-based-buffer-overflow-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-03-28. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2010-4398 · Severity: critical · CVSS 7.8 · Exploited in the wild · Published 2022-03-28

A stack-based buffer overflow vulnerability exists in the RtlQueryRegistryValues function in win32k.sys. Local attackers can exploit this via a crafted REG_BINARY value for the SystemDefaultEUDCFont registry key to gain elevated privileges and bypass User Account Control (UAC).

Technologies: [Microsoft Windows](https://junglewise.ai/threats/technologies/windows). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2010-4398 exploited in the wild?** Yes. CVE-2010-4398 is known to be exploited in the wild, first recorded on 28 March 2022. Treat it as urgent.

**How severe is CVE-2010-4398?** Critical severity, with a CVSS score of 7.8, published 28 March 2022.

**Which products and versions are affected?** Microsoft Windows XP SP2, SP3; Microsoft Windows Server 2003 SP2; Microsoft Windows Vista SP1, SP2; Microsoft Windows Server 2008 Gold, SP2, R2; and 1 more.

**Is there a fix for CVE-2010-4398?** A patch was published on 2011-02-08: Microsoft released security bulletin MS11-011 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2010-4398 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2010-4398?** Check whether you run Microsoft Windows. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Microsoft Windows XP SP2, SP3
- Microsoft Windows Server 2003 SP2
- Microsoft Windows Vista SP1, SP2
- Microsoft Windows Server 2008 Gold, SP2, R2
- Microsoft Windows 7

## Timeline

- 2010-11-25: disclosed: Initial reports of zero-day flaw bypassing UAC
- 2011-02-08: patched: Microsoft released security bulletin MS11-011
- 2022-03-28: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2022-03-28: advisory: NVD publication date

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