# CVE-2018-8343: Windows NDIS Elevation of Privilege Vulnerability CVE-2018-8343 is fixed in 26 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-2018-8343 - Priority: High - CVSS: 7.0 (Important) - EPSS: 0.0129 - 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-2018-8343 ## Description

An elevation of privilege vulnerability exists in the Network Driver Interface Specification (NDIS) when ndis.sys fails to check the length of a buffer prior to copying memory to it.

To exploit the vulnerability, in a local attack scenario, an attacker could run a specially crafted application to elevate the attacker's privilege level. An attacker who successfully exploited this vulnerability could run processes in an elevated context. However, an attacker must first gain access to the local system with the ability to execute a malicious application in order to exploit this vulnerability.

The security update addresses the vulnerability by changing how ndis.sys validates buffer length.

## 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 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 2026-11-07T12:40:37Z 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 Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.