# CVE-2018-8342: Windows NDIS Elevation of Privilege Vulnerability

CVE-2018-8342 is fixed in 5 products on 1 platform, first by KB4343899, released August 14, 2018. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2018-8342
- Priority: High
- CVSS: 7.0 (Important)
- EPSS: 0.0129
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: N/A
- Published: Aug 14, 2018
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8342

## Description

<p>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.</p> <p>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.</p> <p>The security update addresses the vulnerability by changing how ndis.sys validates buffer length.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| 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 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 |

---

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