# CVE-2018-0961: Hyper-V vSMB Remote Code Execution Vulnerability

CVE-2018-0961 is fixed in 8 products on 1 platform, first by KB4103723, released May 8, 2018. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2018-0961
- Priority: Urgent
- CVSS: 7.6 (Critical)
- EPSS: 0.0310
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: May 8, 2018
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-0961

## Description

<p>A remote code execution vulnerability exists when Windows Hyper-V on a host server fails to properly validate vSMB packet data. An attacker who successfully exploited these vulnerabilities could execute arbitrary code on a target operating system.</p> <p>To exploit these vulnerabilities, an attacker running inside a virtual machine could run a specially crafted application that could cause the Hyper-V host operating system to execute arbitrary code.</p> <p>The update addresses the vulnerabilities by correcting how Windows Hyper-V validates vSMB packet data.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.2248 | [KB4103723](https://patchblox.com/security/data/fix/microsoft/kb4103723.md) | May 8, 2018 |
| Microsoft | Windows 10 Version 1703 for x64-based Systems | 15063.1088 | [KB4103731](https://patchblox.com/security/data/fix/microsoft/kb4103731.md) | May 8, 2018 |
| Microsoft | Windows 10 Version 1709 for x64-based Systems | 16299.431 | [KB4103727](https://patchblox.com/security/data/fix/microsoft/kb4103727.md) | May 8, 2018 |
| Microsoft | Windows 10 Version 1803 for x64-based Systems | 17134.48 | [KB4103721](https://patchblox.com/security/data/fix/microsoft/kb4103721.md) | May 8, 2018 |
| Microsoft | Windows Server 2016 | 14393.2248 | [KB4103723](https://patchblox.com/security/data/fix/microsoft/kb4103723.md) | May 8, 2018 |
| Microsoft | Windows Server 2016 (Server Core installation) | 14393.2248 | [KB4103723](https://patchblox.com/security/data/fix/microsoft/kb4103723.md) | May 8, 2018 |
| Microsoft | Windows Server, version 1709  (Server Core Installation) | 16299.431 | [KB4103727](https://patchblox.com/security/data/fix/microsoft/kb4103727.md) | May 8, 2018 |
| Microsoft | Windows Server, version 1803  (Server Core Installation) | 17134.48 | [KB4103721](https://patchblox.com/security/data/fix/microsoft/kb4103721.md) | May 8, 2018 |

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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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