# CVE-2018-8337: Windows Subsystem for Linux Security Feature Bypass Vulnerability

CVE-2018-8337 is fixed in 3 products on 1 platform, first by KB4457142, released September 11, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-8337
- Priority: Routine
- CVSS: 5.3 (Important)
- EPSS: 0.0147
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: N/A
- Published: Sep 11, 2018
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8337

## Description

<p>A security feature bypass vulnerability exists when Windows Subsystem for Linux improperly handles case sensitivity. An attacker who successfully exploited this vulnerability could replace or delete arbitrary files as a low privilege user.</p> <p>A attacker could exploit this vulnerability by running a specially crafted application.</p> <p>The update addresses the vulnerability by correcting how Windows Subsystem for Linux handles case sensitivity.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1709 for 32-bit Systems | 16299.665 | [KB4457142](https://patchblox.com/security/data/fix/microsoft/kb4457142.md) | Sep 11, 2018 |
| Microsoft | Windows 10 Version 1709 for x64-based Systems | 16299.665 | [KB4457142](https://patchblox.com/security/data/fix/microsoft/kb4457142.md) | Sep 11, 2018 |
| Microsoft | Windows Server, version 1709  (Server Core Installation) | 16299.665 | [KB4457142](https://patchblox.com/security/data/fix/microsoft/kb4457142.md) | Sep 11, 2018 |

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Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo