# CVE-2019-1340: Microsoft Windows Elevation of Privilege Vulnerability

CVE-2019-1340 is fixed in 18 products on 1 platform, first by KB4520010, released October 8, 2019. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2019-1340
- Priority: High
- CVSS: 7.8 (Important)
- EPSS: 0.0113
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Oct 8, 2019
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-1340

## Description

<p>An elevation of privilege vulnerability exists in Windows AppX Deployment Server that allows file creation in arbitrary locations.</p> <p>To exploit the vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take control of an affected system.</p> <p>The update addresses the vulnerability by not permitting Windows AppX Deployment Server to create files in arbitrary locations.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1703 for 32-bit Systems | 15063.2108 | [KB4520010](https://patchblox.com/security/data/fix/microsoft/kb4520010.md) | Oct 8, 2019 |
| Microsoft | Windows 10 Version 1703 for x64-based Systems | 15063.2108 | [KB4520010](https://patchblox.com/security/data/fix/microsoft/kb4520010.md) | Oct 8, 2019 |
| Microsoft | Windows 10 Version 1709 for 32-bit Systems | 16299.1451 | [KB4520004](https://patchblox.com/security/data/fix/microsoft/kb4520004.md) | Oct 8, 2019 |
| Microsoft | Windows 10 Version 1709 for ARM64-based Systems | 16299.1451 | [KB4520004](https://patchblox.com/security/data/fix/microsoft/kb4520004.md) | Oct 8, 2019 |
| Microsoft | Windows 10 Version 1709 for x64-based Systems | 16299.1451 | [KB4520004](https://patchblox.com/security/data/fix/microsoft/kb4520004.md) | Oct 8, 2019 |
| Microsoft | Windows 10 Version 1803 for 32-bit Systems | 17134.1069 | [KB4520008](https://patchblox.com/security/data/fix/microsoft/kb4520008.md) | Oct 8, 2019 |
| Microsoft | Windows 10 Version 1803 for ARM64-based Systems | 17134.1069 | [KB4520008](https://patchblox.com/security/data/fix/microsoft/kb4520008.md) | Oct 8, 2019 |
| Microsoft | Windows 10 Version 1803 for x64-based Systems | 17134.1069 | [KB4520008](https://patchblox.com/security/data/fix/microsoft/kb4520008.md) | Oct 8, 2019 |
| Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.805 | [KB4519338](https://patchblox.com/security/data/fix/microsoft/kb4519338.md) | Oct 8, 2019 |
| Microsoft | Windows 10 Version 1809 for ARM64-based Systems | 17763.805 | [KB4519338](https://patchblox.com/security/data/fix/microsoft/kb4519338.md) | Oct 8, 2019 |
| Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.805 | [KB4519338](https://patchblox.com/security/data/fix/microsoft/kb4519338.md) | Oct 8, 2019 |
| Microsoft | Windows 10 Version 1903 for 32-bit Systems | 18362.418 | [KB4517389](https://patchblox.com/security/data/fix/microsoft/kb4517389.md) | Oct 8, 2019 |
| Microsoft | Windows 10 Version 1903 for ARM64-based Systems | 18362.418 | [KB4517389](https://patchblox.com/security/data/fix/microsoft/kb4517389.md) | Oct 8, 2019 |
| Microsoft | Windows 10 Version 1903 for x64-based Systems | 18362.418 | [KB4517389](https://patchblox.com/security/data/fix/microsoft/kb4517389.md) | Oct 8, 2019 |
| Microsoft | Windows Server 2019 | 17763.805 | [KB4519338](https://patchblox.com/security/data/fix/microsoft/kb4519338.md) | Oct 8, 2019 |
| Microsoft | Windows Server 2019 (Server Core installation) | 17763.805 | [KB4519338](https://patchblox.com/security/data/fix/microsoft/kb4519338.md) | Oct 8, 2019 |
| Microsoft | Windows Server, version 1803  (Server Core Installation) | 17134.1069 | [KB4520008](https://patchblox.com/security/data/fix/microsoft/kb4520008.md) | Oct 8, 2019 |
| Microsoft | Windows Server, version 1903 (Server Core installation) | 18362.418 | [KB4517389](https://patchblox.com/security/data/fix/microsoft/kb4517389.md) | Oct 8, 2019 |

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Data as of 2026-11-07T18:46:35Z 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

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