---
id: "CVE-2022-21971"
kind: "vulnerability"
aliases: ["CVE-2022-21971"]
title: "Windows Runtime Remote Code Execution Vulnerability"
severity: "critical"
cvss: 9.3
epss: 0.53781
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Microsoft Windows", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows 10 1809", "fixed": ["10.0.17763.2565"], "affected": "< 10.0.17763.2565", "ecosystem": "vendor"}, {"name": "microsoft windows 10 1909", "fixed": ["10.0.18363.2094"], "affected": "< 10.0.18363.2094", "ecosystem": "vendor"}, {"name": "microsoft windows 10 20h2", "fixed": ["10.0.19042.1526"], "affected": "< 10.0.19042.1526", "ecosystem": "vendor"}, {"name": "microsoft windows 10 21h1", "fixed": ["10.0.19043.1526"], "affected": "< 10.0.19043.1526", "ecosystem": "vendor"}, {"name": "microsoft windows 10 21h2", "fixed": ["10.0.19044.1526"], "affected": "< 10.0.19044.1526", "ecosystem": "vendor"}, {"name": "microsoft windows 11 21h2", "fixed": ["10.0.22000.493"], "affected": "< 10.0.22000.493", "ecosystem": "vendor"}, {"name": "microsoft windows server 2019", "fixed": ["10.0.17763.2565"], "affected": "< 10.0.17763.2565", "ecosystem": "vendor"}, {"name": "microsoft windows server 2022", "fixed": ["10.0.20348.524"], "affected": "< 10.0.20348.524", "ecosystem": "vendor"}, {"name": "microsoft windows server 20h2", "fixed": ["10.0.19042.1526"], "affected": "< 10.0.19042.1526", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "infrastructure", "windows"]
not_affected_if: ["unknown"]
published_at: "2022-02-09T17:15:08+00:00"
first_seen_at: "2026-10-23T19:11:52+00:00"
updated_at: "2026-10-23T22:29:04+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2022-21971", "first_seen_at": "2026-10-23T19:11:52+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2022-21971", "first_seen_at": "2026-10-23T19:13:45+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-21971", "first_seen_at": "2026-10-23T22:29:04+00:00"}]
---

# Windows Runtime Remote Code Execution Vulnerability

Microsoft Windows Runtime has an unspecified flaw that allows remote code execution. Listed in CISA's known-exploited catalog, so attackers are using it in real attacks.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Microsoft Windows affected ? fixed ?
- vendor:microsoft windows 10 1809 affected < 10.0.17763.2565 fixed 10.0.17763.2565
- vendor:microsoft windows 10 1909 affected < 10.0.18363.2094 fixed 10.0.18363.2094
- vendor:microsoft windows 10 20h2 affected < 10.0.19042.1526 fixed 10.0.19042.1526
- vendor:microsoft windows 10 21h1 affected < 10.0.19043.1526 fixed 10.0.19043.1526
- vendor:microsoft windows 10 21h2 affected < 10.0.19044.1526 fixed 10.0.19044.1526
- vendor:microsoft windows 11 21h2 affected < 10.0.22000.493 fixed 10.0.22000.493
- vendor:microsoft windows server 2019 affected < 10.0.17763.2565 fixed 10.0.17763.2565
- vendor:microsoft windows server 2022 affected < 10.0.20348.524 fixed 10.0.20348.524
- vendor:microsoft windows server 20h2 affected < 10.0.19042.1526 fixed 10.0.19042.1526

## Fix

Apply the Microsoft Windows updates per vendor instructions, as CISA requires; the sources do not name the patched build.

## Timeline

- 2026-10-23T19:11:52+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2022-21971
- 2026-10-23T19:13:45+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2022-21971
- 2026-10-23T22:29:04+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2022-21971

## From the sources

Microsoft Windows Runtime contains an unspecified vulnerability that allows for remote code execution.

CISA required action: Apply updates per vendor instructions.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_