# CVE-2017-8622: Windows Subsystem for Linux Elevation of Privilege Vulnerability

CVE-2017-8622 is fixed in Windows 10 Version 1703 for x64-based Systems on 1 platform by KB4034674 (version 15063.540), released August 8, 2017. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2017-8622
- Priority: Urgent
- CVSS: 7.0 (Critical)
- EPSS: 0.0130
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Unlikely
- Published: Aug 8, 2017
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2017-8622

## Description

<p>An elevation of privilege vulnerability exists in the way that the Windows Subsystem for Linux handles NT pipes. An attacker who successfully exploited the vulnerability could execute code with elevated permissions.</p> <p>To exploit the vulnerability, a locally authenticated attacker could run a specially crafted application.</p> <p>The security update addresses the vulnerability by correcting how Windows Subsystem for Linux handles NT pipes.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1703 for x64-based Systems | 15063.540 | [KB4034674](https://patchblox.com/security/data/fix/microsoft/kb4034674.md) | Aug 8, 2017 |

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Data as of 2026-11-07T06:34:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo