# CVE-2020-0689: Microsoft Secure Boot Security Feature Bypass Vulnerability

CVE-2020-0689 is fixed in 16 products on 1 platform, first by KB4535680, released February 12, 2020. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2020-0689
- Priority: High
- CVSS: 8.2 (Important)
- EPSS: 0.0108
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: yes
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Feb 12, 2020
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-0689

## Description

<p>A security feature bypass vulnerability exists in secure boot. An attacker who successfully exploited the vulnerability can bypass secure boot and load untrusted software.</p> <p>To exploit the vulnerability, an attacker could run a specially crafted application.</p> <p>The security update addresses the vulnerability by blocking vulnerable third-party bootloaders.</p> <p>For further information see <a href="https://support.microsoft.com/en-us/help/4535680">Security update for Secure Boot DBX: January 12, 2021</a>.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1607 for x64-based Systems |  | [KB5012170](https://patchblox.com/security/data/fix/microsoft/kb5012170.md) | Aug 9, 2022 |
| Microsoft | Windows 10 Version 1803 for x64-based Systems |  | [KB4535680](https://patchblox.com/security/data/fix/microsoft/kb4535680.md) | Feb 12, 2020 |
| Microsoft | Windows 10 Version 1809 for x64-based Systems |  | [KB5012170](https://patchblox.com/security/data/fix/microsoft/kb5012170.md) | Aug 9, 2022 |
| Microsoft | Windows 10 Version 1909 for x64-based Systems |  | [KB4535680](https://patchblox.com/security/data/fix/microsoft/kb4535680.md) | Feb 12, 2020 |
| Microsoft | Windows 10 for x64-based Systems |  | [KB5012170](https://patchblox.com/security/data/fix/microsoft/kb5012170.md) | Aug 9, 2022 |
| Microsoft | Windows 8.1 for x64-based systems |  | [KB5012170](https://patchblox.com/security/data/fix/microsoft/kb5012170.md) | Aug 9, 2022 |
| Microsoft | Windows Server 2012 |  | [KB5012170](https://patchblox.com/security/data/fix/microsoft/kb5012170.md) | Aug 9, 2022 |
| Microsoft | Windows Server 2012 (Server Core installation) |  | [KB5012170](https://patchblox.com/security/data/fix/microsoft/kb5012170.md) | Aug 9, 2022 |
| Microsoft | Windows Server 2012 R2 |  | [KB5012170](https://patchblox.com/security/data/fix/microsoft/kb5012170.md) | Aug 9, 2022 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB5012170](https://patchblox.com/security/data/fix/microsoft/kb5012170.md) | Aug 9, 2022 |
| Microsoft | Windows Server 2016 |  | [KB5012170](https://patchblox.com/security/data/fix/microsoft/kb5012170.md) | Aug 9, 2022 |
| Microsoft | Windows Server 2016 (Server Core installation) |  | [KB5012170](https://patchblox.com/security/data/fix/microsoft/kb5012170.md) | Aug 9, 2022 |
| Microsoft | Windows Server 2019 |  | [KB5012170](https://patchblox.com/security/data/fix/microsoft/kb5012170.md) | Aug 9, 2022 |
| Microsoft | Windows Server 2019 (Server Core installation) |  | [KB5012170](https://patchblox.com/security/data/fix/microsoft/kb5012170.md) | Aug 9, 2022 |
| Microsoft | Windows Server, version 1803  (Server Core Installation) |  | [KB4535680](https://patchblox.com/security/data/fix/microsoft/kb4535680.md) | Feb 12, 2020 |
| Microsoft | Windows Server, version 1909 (Server Core installation) |  | [KB4535680](https://patchblox.com/security/data/fix/microsoft/kb4535680.md) | Feb 12, 2020 |

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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

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