# CVE-2020-17040: Windows Hyper-V Security Feature Bypass Vulnerability

CVE-2020-17040 is fixed in 18 products on 1 platform, first by KB4586830, released November 10, 2020. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2020-17040
- Priority: Routine
- CVSS: 6.5 (Important)
- EPSS: 0.0270
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Nov 10, 2020
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-17040

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.4046 | [KB4586830](https://patchblox.com/security/data/fix/microsoft/kb4586830.md) | Nov 10, 2020 |
| Microsoft | Windows 10 Version 1803 for x64-based Systems | 17134.1845 | [KB4586785](https://patchblox.com/security/data/fix/microsoft/kb4586785.md) | Nov 10, 2020 |
| Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.1577 | [KB4586793](https://patchblox.com/security/data/fix/microsoft/kb4586793.md) | Nov 10, 2020 |
| Microsoft | Windows 10 Version 1903 for x64-based Systems |  | [KB4586786](https://patchblox.com/security/data/fix/microsoft/kb4586786.md) | Nov 10, 2020 |
| Microsoft | Windows 10 Version 1909 for x64-based Systems |  | [KB4586786](https://patchblox.com/security/data/fix/microsoft/kb4586786.md) | Nov 10, 2020 |
| Microsoft | Windows 10 Version 2004 for x64-based Systems |  | [KB4586781](https://patchblox.com/security/data/fix/microsoft/kb4586781.md) | Nov 10, 2020 |
| Microsoft | Windows 10 for x64-based Systems | 10240.18756 | [KB4586787](https://patchblox.com/security/data/fix/microsoft/kb4586787.md) | Nov 10, 2020 |
| Microsoft | Windows 8.1 for x64-based systems |  | [KB4586845](https://patchblox.com/security/data/fix/microsoft/kb4586845.md) | Nov 10, 2020 |
| Microsoft | Windows 8.1 for x64-based systems |  | [KB4586823](https://patchblox.com/security/data/fix/microsoft/kb4586823.md) | Nov 10, 2020 |
| Microsoft | Windows Server 2012 R2 |  | [KB4586845](https://patchblox.com/security/data/fix/microsoft/kb4586845.md) | Nov 10, 2020 |
| Microsoft | Windows Server 2012 R2 |  | [KB4586823](https://patchblox.com/security/data/fix/microsoft/kb4586823.md) | Nov 10, 2020 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB4586845](https://patchblox.com/security/data/fix/microsoft/kb4586845.md) | Nov 10, 2020 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB4586823](https://patchblox.com/security/data/fix/microsoft/kb4586823.md) | Nov 10, 2020 |
| Microsoft | Windows Server 2016 | 14393.4046 | [KB4586830](https://patchblox.com/security/data/fix/microsoft/kb4586830.md) | Nov 10, 2020 |
| Microsoft | Windows Server 2016 (Server Core installation) | 14393.4046 | [KB4586830](https://patchblox.com/security/data/fix/microsoft/kb4586830.md) | Nov 10, 2020 |
| Microsoft | Windows Server 2019 | 17763.1577 | [KB4586793](https://patchblox.com/security/data/fix/microsoft/kb4586793.md) | Nov 10, 2020 |
| Microsoft | Windows Server 2019 (Server Core installation) | 17763.1577 | [KB4586793](https://patchblox.com/security/data/fix/microsoft/kb4586793.md) | Nov 10, 2020 |
| Microsoft | Windows Server, version 1903 (Server Core installation) |  | [KB4586786](https://patchblox.com/security/data/fix/microsoft/kb4586786.md) | Nov 10, 2020 |
| Microsoft | Windows Server, version 1909 (Server Core installation) |  | [KB4586786](https://patchblox.com/security/data/fix/microsoft/kb4586786.md) | Nov 10, 2020 |
| Microsoft | Windows Server, version 2004 (Server Core installation) |  | [KB4586781](https://patchblox.com/security/data/fix/microsoft/kb4586781.md) | Nov 10, 2020 |
| Microsoft | Windows Server, version 20H2 (Server Core Installation) |  | [KB4586781](https://patchblox.com/security/data/fix/microsoft/kb4586781.md) | Nov 10, 2020 |

---

Data as of 2026-11-08T00:53:09Z 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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

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.