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Known exploited vulnerability · CISA KEV

CVE-2024-29988: Microsoft SmartScreen Prompt Security Feature Bypass Vulnerability

Microsoft SmartScreen Prompt contains a security feature bypass vulnerability that allows an attacker to bypass the Mark of the Web (MotW) feature. This vulnerability can be chained with CVE-2023-38831 and CVE-2024-21412 to execute a malicious file.

CVE-2024-29988

Exploited in the wild. Fix this first.

CISA added it to the Known Exploited Vulnerabilities catalog on 2024-04-30: attackers are using it right now.

CISA KEV
Listed
Added 2024-04-30 · federal fix-by 2024-05-21
EPSS (30 days)
45%
Higher than 99% of CVEs · 2026-11-01
CVSS v3.1
8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

What CISA says

Microsoft SmartScreen Prompt Security Feature Bypass Vulnerability

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

NVD description · published 2024-04-09

SmartScreen Prompt Security Feature Bypass Vulnerability

Full record on NVD

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How to check if you are exposed to CVE-2024-29988

  1. Find every Microsoft SmartScreen Prompt system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
  2. Compare each version with the fixed versions in the vendor advisory below. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
  3. Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2024-29988.

US federal agencies had to fix this by 2024-05-21. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Affected versions

Versions the National Vulnerability Database lists as vulnerable to CVE-2024-29988. Check the vendor advisory for the exact fixed builds before you sign anything off.

ProductVulnerable versions
Microsoft Windows 10 1809before 10.0.17763.5696
Microsoft Windows 10 21h2before 10.0.19044.4291
Microsoft Windows 10 22h2before 10.0.19045.4291
Microsoft Windows 11 21h2before 10.0.22000.2899
Microsoft Windows 11 22h2before 10.0.22621.3447
Microsoft Windows 11 23h2before 10.0.22631.3447

NVD lists 3 more affected products; see the full record on NVD.

Timeline

  1. · Published in the National Vulnerability Database
  2. · Added to CISA's Known Exploited Vulnerabilities catalog, 21 days after it was published
  3. · Fix-by date for US federal agencies, passed 894 days ago

Vendor advisories and fixes

Weakness type

More exploited Microsoft vulnerabilities

CISA lists 390 exploited Microsoft vulnerabilities. The closest matches:

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Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

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