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CVE-2024-21351

Microsoft Windows SmartScreen Security Feature Bypass

7.6 HIGHActively exploited (CISA KEV)EPSS 27.8%
  1. Published13 Feb 2024
  2. Added to CISA KEV13 Feb 2024
  3. Remediation due5 Mar 2024
Actively exploited (CISA KEV)

Microsoft Windows SmartScreen contains a security feature bypass vulnerability that allows an attacker to bypass the SmartScreen user experience and inject code to potentially gain code execution, which could lead to some data exposure, lack of system availability, or both.

Added to KEV: 13 Feb 2024Federal remediation due: 5 Mar 2024

Description

Windows SmartScreen Security Feature Bypass Vulnerability

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityLow
IntegrityHigh
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L

Affected products

Microsoft Windows 10 1507< 10.0.10240.20469
Microsoft Windows 10 1607< 10.0.14393.6709
Microsoft Windows 10 1809< 10.0.17763.5458
Microsoft Windows 10 21h2< 10.0.19044.4046
Microsoft Windows 10 22h2< 10.0.19045.4046
Microsoft Windows 11 21h2< 10.0.22000.2777
Microsoft Windows 11 22h2< 10.0.22621.3155
Microsoft Windows 11 23h2< 10.0.22631.3155
Microsoft Windows Server 2016all versions
Microsoft Windows Server 2019< 10.0.17763.5458
Microsoft Windows Server 2022< 10.0.20348.2322
Microsoft Windows Server 2022 23h2< 10.0.25398.709

Remediation

Fixed in
Microsoft Windows 10 1507≥ 10.0.10240.20469
Microsoft Windows 10 1607≥ 10.0.14393.6709
Microsoft Windows 10 1809≥ 10.0.17763.5458
Microsoft Windows 10 21h2≥ 10.0.19044.4046
Microsoft Windows 10 22h2≥ 10.0.19045.4046
Microsoft Windows 11 21h2≥ 10.0.22000.2777
Microsoft Windows 11 22h2≥ 10.0.22621.3155
Microsoft Windows 11 23h2≥ 10.0.22631.3155
Microsoft Windows Server 2019≥ 10.0.17763.5458
Microsoft Windows Server 2022≥ 10.0.20348.2322

References

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Frequently asked

Is CVE-2024-21351 being actively exploited?

Yes. CVE-2024-21351 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 13 Feb 2024.

How severe is CVE-2024-21351?

CVE-2024-21351 has a CVSS 3.1 base score of 7.6, rated high. EPSS estimates a 27.8% probability of exploitation.

Which products are affected by CVE-2024-21351?

Affected products include Microsoft Windows 10 1507, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, and 7 more.

How do I fix CVE-2024-21351?

Upgrade affected software to a fixed version, for example Microsoft Windows 10 1507 10.0.10240.20469, Microsoft Windows 10 1607 10.0.14393.6709, Microsoft Windows 10 1809 10.0.17763.5458 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2024-21351 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.