---
id: "CVE-2024-21351"
kind: "vulnerability"
aliases: ["CVE-2024-21351"]
title: "Windows SmartScreen Security Feature Bypass Vulnerability"
severity: "high"
cvss: 7.6
epss: null
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Microsoft Windows", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows 10 1507", "fixed": ["10.0.10240.20469"], "affected": "< 10.0.10240.20469", "ecosystem": "vendor"}, {"name": "microsoft windows 10 1607", "fixed": ["10.0.14393.6709"], "affected": "< 10.0.14393.6709", "ecosystem": "vendor"}, {"name": "microsoft windows 10 1809", "fixed": ["10.0.17763.5458"], "affected": "< 10.0.17763.5458", "ecosystem": "vendor"}, {"name": "microsoft windows 10 21h2", "fixed": ["10.0.19044.4046"], "affected": "< 10.0.19044.4046", "ecosystem": "vendor"}, {"name": "microsoft windows 10 22h2", "fixed": ["10.0.19045.4046"], "affected": "< 10.0.19045.4046", "ecosystem": "vendor"}, {"name": "microsoft windows 11 21h2", "fixed": ["10.0.22000.2777"], "affected": "< 10.0.22000.2777", "ecosystem": "vendor"}, {"name": "microsoft windows 11 22h2", "fixed": ["10.0.22621.3155"], "affected": "< 10.0.22621.3155", "ecosystem": "vendor"}, {"name": "microsoft windows 11 23h2", "fixed": ["10.0.22631.3155"], "affected": "< 10.0.22631.3155", "ecosystem": "vendor"}, {"name": "microsoft windows server 2016", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows server 2019", "fixed": ["10.0.17763.5458"], "affected": "< 10.0.17763.5458", "ecosystem": "vendor"}, {"name": "microsoft windows server 2022", "fixed": ["10.0.20348.2322"], "affected": "< 10.0.20348.2322", "ecosystem": "vendor"}, {"name": "microsoft windows server 2022 23h2", "fixed": ["10.0.25398.709"], "affected": "< 10.0.25398.709", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["endpoints", "exploited", "infrastructure", "windows"]
not_affected_if: ["unknown"]
published_at: "2024-02-13T00:00:00+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T22:29:05+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2024-21351", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-21351", "first_seen_at": "2026-10-23T22:29:05+00:00"}]
---

# Windows SmartScreen Security Feature Bypass Vulnerability

Microsoft Windows SmartScreen has a security feature bypass that lets an attacker get past its user warnings and inject code. The attacker can then potentially run code, expose some data, or disrupt the system.

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

## Affected

- vendor:Microsoft Windows affected ? fixed ?
- vendor:microsoft windows 10 1507 affected < 10.0.10240.20469 fixed 10.0.10240.20469
- vendor:microsoft windows 10 1607 affected < 10.0.14393.6709 fixed 10.0.14393.6709
- vendor:microsoft windows 10 1809 affected < 10.0.17763.5458 fixed 10.0.17763.5458
- vendor:microsoft windows 10 21h2 affected < 10.0.19044.4046 fixed 10.0.19044.4046
- vendor:microsoft windows 10 22h2 affected < 10.0.19045.4046 fixed 10.0.19045.4046
- vendor:microsoft windows 11 21h2 affected < 10.0.22000.2777 fixed 10.0.22000.2777
- vendor:microsoft windows 11 22h2 affected < 10.0.22621.3155 fixed 10.0.22621.3155
- vendor:microsoft windows 11 23h2 affected < 10.0.22631.3155 fixed 10.0.22631.3155
- vendor:microsoft windows server 2016 affected ? fixed ?
- vendor:microsoft windows server 2019 affected < 10.0.17763.5458 fixed 10.0.17763.5458
- vendor:microsoft windows server 2022 affected < 10.0.20348.2322 fixed 10.0.20348.2322
- vendor:microsoft windows server 2022 23h2 affected < 10.0.25398.709 fixed 10.0.25398.709

## Fix

Apply the mitigations per Microsoft's vendor instructions, or discontinue use of the affected product if mitigations are unavailable (CISA required action).

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2024-21351
- 2026-10-23T22:29:05+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2024-21351

## From the sources

Microsoft Windows SmartScreen contains a security feature bypass vulnerability that allows an attacker to bypass the SmartScreen user experience and inject code to potentially gain code execution, which could lead to some data exposure, lack of system availability, or both.

CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

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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_