How severe is CVE-2024-21351?

CVE-2024-21351 has a CVSS 3.1 base score of 7.6 (HIGH). EPSS estimates a 27.8% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2024-21351: Windows SmartScreen Security Feature Bypass

CISA Known Exploited Vulnerabilities

Microsoft Windows SmartScreen Security Feature Bypass Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2024-02-13

Remediation due

2024-03-05

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

CISA notes
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2024-21351; https://nvd.nist.gov/vuln/detail/CVE-2024-21351

Description

Windows SmartScreen Security Feature Bypass Vulnerability

Severity

CVSS 3.1 · CNA7.6 HIGH

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

SSVC · CISA-ADP

Exploitationactive

Automatableno

Technical impactpartial

Exploitation Context

as of October 13, 2026

All KEV statistics→

CISA added CVE-2024-21351 to the KEV catalog on the day its CVE record was published. The median for entries added in 2024 is 21.5 days.
It is one of 390 Microsoft entries in the CISA KEV catalog, and one of 36 added in 2024.
Its current EPSS score (27.8%) is higher than that of 40% of CISA KEV entries.

Affected Products

Vendor	Product	Affected versions
Microsoft	Microsoft Windows 10 Version 1507	10.0.10240.0 to <10.0.10240.20469
Microsoft	Microsoft Windows 10 Version 1607	10.0.14393.0 to <10.0.14393.6709
Microsoft	Microsoft Windows 10 Version 1809	10.0.17763.0 to <10.0.17763.5458
Microsoft	Microsoft Windows 10 Version 1809	10.0.0 to <10.0.17763.5458
Microsoft	Microsoft Windows 10 Version 21H2	10.0.19043.0 to <10.0.19044.4046
Microsoft	Microsoft Windows 10 Version 22H2	10.0.19045.0 to <10.0.19045.4046
Microsoft	Microsoft Windows 11 version 21H2	10.0.0 to <10.0.22000.2777
Microsoft	Microsoft Windows 11 version 22H2	10.0.22621.0 to <10.0.22621.3155
Microsoft	Microsoft Windows 11 version 22H3	10.0.22631.0 to <10.0.22631.3155
Microsoft	Microsoft Windows 11 Version 23H2	10.0.22631.0 to <10.0.22631.3155
Microsoft	Microsoft Windows Server 2016	10.0.14393.0 to <10.0.14393.6709
Microsoft	Microsoft Windows Server 2019	10.0.17763.0 to <10.0.17763.5458
Microsoft	Microsoft Windows Server 2022	10.0.20348.0 to <10.0.20348.2322

References

1 Links

Vendor advisories

Windows SmartScreen Security Feature Bypass Vulnerability

Record Details

Published

2024-02-13

Last updated

2026-08-10

Assigner (CNA)

microsoft

Credited to

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Tool categories

Application Security Tools Penetration Testing Tools

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.

CVE-2024-21351