---
title: "CVE-2024-38217: Microsoft Windows Mark of the Web (MOTW) Protection Mechanism Failure Vulnerability"
url: https://erroneo.us/security/cve/CVE-2024-38217/
description: "CVE-2024-38217 (Microsoft Windows): Exploited in the wild (CISA KEV). Windows Mark of the Web Security Feature Bypass Vulnerability"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-09-10
date_modified: 2026-08-10
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-38217"
kev: true
cvss: 5.4
epss: 0.10026
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2024-38217: Microsoft Windows Mark of the Web (MOTW) Protection Mechanism Failure Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Microsoft Windows. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-09-10, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-10-01 ; treat that as the outer limit, not the target.
- EPSS 10.0% , percentile 96: FIRST’s model estimates a 10.0% chance of exploitation activity in the next 30 days, higher than 96% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.

## What it is

Windows Mark of the Web Security Feature Bypass Vulnerability

## Affected products (CVE record)

- Microsoft Windows 10 Version 1507: 10.0.10240.0 < 10.0.10240.20766
- Microsoft Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.7336
- Microsoft Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.6293
- Microsoft Windows 10 Version 21H2: 10.0.19043.0 < 10.0.19044.4894
- Microsoft Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19045.4894
- Microsoft Windows 11 version 21H2: 10.0.0 < 10.0.22000.3197
- Microsoft Windows 11 version 22H2: 10.0.22621.0 < 10.0.22621.4169
- Microsoft Windows 11 version 22H3: 10.0.22631.0 < 10.0.22631.4169
- Microsoft Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.4169
- Microsoft Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.1742

## Severity

- microsoft CVSS 3.1: 5.4 `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`

## Exploitation

- CISA KEV: added 2024-09-10; federal due date 2024-10-01. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable no , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 10.03% probability of exploitation activity in the next 30 days; percentile 96.

## Sources

- [Windows Mark of the Web Security Feature Bypass Vulnerability](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-38217)
- [CVE.org record CVE-2024-38217](https://www.cve.org/CVERecord?id=CVE-2024-38217)
- [NVD entry CVE-2024-38217](https://nvd.nist.gov/vuln/detail/CVE-2024-38217)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-38217)
- [elastic.co](https://www.elastic.co/security-labs/dismantling-smart-app-control)

---
Source page: https://erroneo.us/security/cve/CVE-2024-38217/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt