# CVE-2018-8566: BitLocker Security Feature Bypass Vulnerability

CVE-2018-8566 is fixed in 19 products on 1 platform, first by KB4465659, released November 13, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-8566
- Priority: Routine
- CVSS: 4.6 (Important)
- EPSS: 0.0106
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: yes
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Nov 13, 2018
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8566

## Description

<p>A security feature bypass vulnerability exists when Windows improperly suspends BitLocker Device Encryption. An attacker with physical access to a powered off system could exploit this vulnerability to gain access to encrypted data.</p> <p>To exploit the vulnerability, an attacker must gain physical access to the target system prior to the next system reboot.</p> <p>The security update fixes the vulnerability by ensuring Windows resumes BitLocker Device Encryption.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1607 for 32-bit Systems |  | [KB4465659](https://patchblox.com/security/data/fix/microsoft/kb4465659.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1607 for x64-based Systems |  | [KB4465659](https://patchblox.com/security/data/fix/microsoft/kb4465659.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1703 for 32-bit Systems |  | [KB4465660](https://patchblox.com/security/data/fix/microsoft/kb4465660.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1703 for x64-based Systems |  | [KB4465660](https://patchblox.com/security/data/fix/microsoft/kb4465660.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1709 for 32-bit Systems |  | [KB4465661](https://patchblox.com/security/data/fix/microsoft/kb4465661.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1709 for ARM64-based Systems |  | [KB4465661](https://patchblox.com/security/data/fix/microsoft/kb4465661.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1709 for x64-based Systems |  | [KB4465661](https://patchblox.com/security/data/fix/microsoft/kb4465661.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1803 for 32-bit Systems |  | [KB4465663](https://patchblox.com/security/data/fix/microsoft/kb4465663.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1803 for ARM64-based Systems |  | [KB4465663](https://patchblox.com/security/data/fix/microsoft/kb4465663.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1803 for x64-based Systems |  | [KB4465663](https://patchblox.com/security/data/fix/microsoft/kb4465663.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1809 for 32-bit Systems |  | [KB4465664](https://patchblox.com/security/data/fix/microsoft/kb4465664.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1809 for ARM64-based Systems |  | [KB4465664](https://patchblox.com/security/data/fix/microsoft/kb4465664.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1809 for x64-based Systems |  | [KB4465664](https://patchblox.com/security/data/fix/microsoft/kb4465664.md) | Nov 13, 2018 |
| Microsoft | Windows Server 2016 |  | [KB4465659](https://patchblox.com/security/data/fix/microsoft/kb4465659.md) | Nov 13, 2018 |
| Microsoft | Windows Server 2016 (Server Core installation) |  | [KB4465659](https://patchblox.com/security/data/fix/microsoft/kb4465659.md) | Nov 13, 2018 |
| Microsoft | Windows Server 2019 |  | [KB4465664](https://patchblox.com/security/data/fix/microsoft/kb4465664.md) | Nov 13, 2018 |
| Microsoft | Windows Server 2019 (Server Core installation) |  | [KB4465664](https://patchblox.com/security/data/fix/microsoft/kb4465664.md) | Nov 13, 2018 |
| Microsoft | Windows Server, version 1709  (Server Core Installation) |  | [KB4465661](https://patchblox.com/security/data/fix/microsoft/kb4465661.md) | Nov 13, 2018 |
| Microsoft | Windows Server, version 1803  (Server Core Installation) |  | [KB4465663](https://patchblox.com/security/data/fix/microsoft/kb4465663.md) | Nov 13, 2018 |

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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