# CVE-2018-8339: Windows Installer Elevation of Privilege Vulnerability CVE-2018-8339 is fixed in 31 products on 1 platform, first by KB4343887, released August 14, 2018. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2018-8339 - Priority: High - CVSS: 7.4 (Important) - EPSS: 0.0116 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Vendor exploitability assessment: Exploitation Less Likely - Published: Aug 14, 2018 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8339 ## Description

An elevation of privilege vulnerability exists in the Windows Installer when the Windows Installer fails to properly sanitize input leading to an insecure library loading behavior.

A locally authenticated attacker could run arbitrary code with elevated system privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

The security update addresses the vulnerability by correcting the input sanitization error to preclude unintended elevation.

## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Windows 10 Version 1607 for 32-bit Systems | 14393.2430 | [KB4343887](https://patchblox.com/security/data/fix/microsoft/kb4343887.md) | Aug 14, 2018 | | Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.2430 | [KB4343887](https://patchblox.com/security/data/fix/microsoft/kb4343887.md) | Aug 14, 2018 | | Microsoft | Windows 10 Version 1703 for 32-bit Systems | 15063.1266 | [KB4343885](https://patchblox.com/security/data/fix/microsoft/kb4343885.md) | Aug 14, 2018 | | Microsoft | Windows 10 Version 1703 for x64-based Systems | 15063.1266 | [KB4343885](https://patchblox.com/security/data/fix/microsoft/kb4343885.md) | Aug 14, 2018 | | Microsoft | Windows 10 Version 1709 for 32-bit Systems | 16299.611 | [KB4343897](https://patchblox.com/security/data/fix/microsoft/kb4343897.md) | Aug 14, 2018 | | Microsoft | Windows 10 Version 1709 for x64-based Systems | 16299.611 | [KB4343897](https://patchblox.com/security/data/fix/microsoft/kb4343897.md) | Aug 14, 2018 | | Microsoft | Windows 10 Version 1803 for 32-bit Systems | 17134.228 | [KB4343909](https://patchblox.com/security/data/fix/microsoft/kb4343909.md) | Aug 14, 2018 | | Microsoft | Windows 10 Version 1803 for x64-based Systems | 17134.228 | [KB4343909](https://patchblox.com/security/data/fix/microsoft/kb4343909.md) | Aug 14, 2018 | | Microsoft | Windows 10 for 32-bit Systems | 10240.17946 | [KB4343892](https://patchblox.com/security/data/fix/microsoft/kb4343892.md) | Aug 14, 2018 | | Microsoft | Windows 10 for x64-based Systems | 10240.17946 | [KB4343892](https://patchblox.com/security/data/fix/microsoft/kb4343892.md) | Aug 14, 2018 | | Microsoft | Windows 7 for 32-bit Systems Service Pack 1 | | [KB4343899](https://patchblox.com/security/data/fix/microsoft/kb4343899.md) | Aug 14, 2018 | | Microsoft | Windows 7 for 32-bit Systems Service Pack 1 | | [KB4343900](https://patchblox.com/security/data/fix/microsoft/kb4343900.md) | Aug 14, 2018 | | Microsoft | Windows 7 for x64-based Systems Service Pack 1 | | [KB4343899](https://patchblox.com/security/data/fix/microsoft/kb4343899.md) | Aug 14, 2018 | | Microsoft | Windows 7 for x64-based Systems Service Pack 1 | | [KB4343900](https://patchblox.com/security/data/fix/microsoft/kb4343900.md) | Aug 14, 2018 | | Microsoft | Windows 8.1 for 32-bit systems | | [KB4343888](https://patchblox.com/security/data/fix/microsoft/kb4343888.md) | Aug 14, 2018 | | Microsoft | Windows 8.1 for 32-bit systems | | [KB4343898](https://patchblox.com/security/data/fix/microsoft/kb4343898.md) | Aug 14, 2018 | | Microsoft | Windows 8.1 for x64-based systems | | [KB4343888](https://patchblox.com/security/data/fix/microsoft/kb4343888.md) | Aug 14, 2018 | | Microsoft | Windows 8.1 for x64-based systems | | [KB4343898](https://patchblox.com/security/data/fix/microsoft/kb4343898.md) | Aug 14, 2018 | | Microsoft | Windows RT 8.1 | | [KB4343898](https://patchblox.com/security/data/fix/microsoft/kb4343898.md) | Aug 14, 2018 | | Microsoft | Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 | | [KB4343899](https://patchblox.com/security/data/fix/microsoft/kb4343899.md) | Aug 14, 2018 | | Microsoft | Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 | | [KB4343900](https://patchblox.com/security/data/fix/microsoft/kb4343900.md) | Aug 14, 2018 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4343899](https://patchblox.com/security/data/fix/microsoft/kb4343899.md) | Aug 14, 2018 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4343900](https://patchblox.com/security/data/fix/microsoft/kb4343900.md) | Aug 14, 2018 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB4343899](https://patchblox.com/security/data/fix/microsoft/kb4343899.md) | Aug 14, 2018 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB4343900](https://patchblox.com/security/data/fix/microsoft/kb4343900.md) | Aug 14, 2018 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB4340937](https://patchblox.com/security/data/fix/microsoft/kb4340937.md) | Aug 14, 2018 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | | [KB4340937](https://patchblox.com/security/data/fix/microsoft/kb4340937.md) | Aug 14, 2018 | | Microsoft | Windows Server 2008 for Itanium-Based Systems Service Pack 2 | | [KB4340937](https://patchblox.com/security/data/fix/microsoft/kb4340937.md) | Aug 14, 2018 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB4340937](https://patchblox.com/security/data/fix/microsoft/kb4340937.md) | Aug 14, 2018 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | | [KB4340937](https://patchblox.com/security/data/fix/microsoft/kb4340937.md) | Aug 14, 2018 | | Microsoft | Windows Server 2012 | | [KB4343896](https://patchblox.com/security/data/fix/microsoft/kb4343896.md) | Aug 14, 2018 | | Microsoft | Windows Server 2012 | | [KB4343901](https://patchblox.com/security/data/fix/microsoft/kb4343901.md) | Aug 14, 2018 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB4343896](https://patchblox.com/security/data/fix/microsoft/kb4343896.md) | Aug 14, 2018 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB4343901](https://patchblox.com/security/data/fix/microsoft/kb4343901.md) | Aug 14, 2018 | | Microsoft | Windows Server 2012 R2 | | [KB4343888](https://patchblox.com/security/data/fix/microsoft/kb4343888.md) | Aug 14, 2018 | | Microsoft | Windows Server 2012 R2 | | [KB4343898](https://patchblox.com/security/data/fix/microsoft/kb4343898.md) | Aug 14, 2018 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4343888](https://patchblox.com/security/data/fix/microsoft/kb4343888.md) | Aug 14, 2018 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4343898](https://patchblox.com/security/data/fix/microsoft/kb4343898.md) | Aug 14, 2018 | | Microsoft | Windows Server 2016 | 14393.2430 | [KB4343887](https://patchblox.com/security/data/fix/microsoft/kb4343887.md) | Aug 14, 2018 | | Microsoft | Windows Server 2016 (Server Core installation) | 14393.2430 | [KB4343887](https://patchblox.com/security/data/fix/microsoft/kb4343887.md) | Aug 14, 2018 | | Microsoft | Windows Server, version 1709 (Server Core Installation) | 16299.611 | [KB4343897](https://patchblox.com/security/data/fix/microsoft/kb4343897.md) | Aug 14, 2018 | | Microsoft | Windows Server, version 1803 (Server Core Installation) | 17134.228 | [KB4343909](https://patchblox.com/security/data/fix/microsoft/kb4343909.md) | Aug 14, 2018 | --- Data as of 2026-11-08T19:12:23Z UTC. 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