Is CVE-2024-21351 actively exploited?

Yes. KEV Intelligence tracks CVE-2024-21351 as a known exploited vulnerability. Confidence is confirmed.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence has not yet recorded sensor-observed exploitation attempts for CVE-2024-21351. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2024-21351 affects Microsoft Windows 10 Version 1507 and 11 other products. KEV Intelligence lists 13 version rows; examples include 10.0.10240.0 to < 10.0.10240.20469, 10.0.14393.0 to < 10.0.14393.6709, and 10.0.17763.0 to < 10.0.17763.5458.

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

CVE-2024-21351 Exploited in the Wild — Windows 10 Version 1507, Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 21H2, Windows 11 version 22H2, Windows 11 version 22H3, Windows 11 Version 23H2, Windows Server 2016, Windows Server 2019, Windows Server 2022

Q: What is CVE-2024-21351?

CVE-2024-21351 is an unauthenticated Windows SmartScreen Security Feature Bypass Vulnerability affecting Microsoft Windows 10 Version 1507 and 11 other products.

Q: How should organizations remediate it?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Q: Is it in CISA KEV?

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

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2024-21351 is an unauthenticated Windows SmartScreen Security Feature Bypass Vulnerability affecting Microsoft Windows 10 Version 1507 and 11 other products.

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Microsoft / Windows 10 Version 1507 affected before 10.0.10240.20469.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Windows SmartScreen Security Feature Bypass Vulnerability

Vendor Product Affected Status

Microsoft Windows 10 Version 1507 Before 10.0.10240.20469 Affected

Microsoft Windows 10 Version 1607 Before 10.0.14393.6709 Affected

Microsoft Windows 10 Version 1809 Before 10.0.17763.5458 Affected

Microsoft Windows 10 Version 21H2 Before 10.0.19044.4046 Affected

Microsoft Windows 10 Version 22H2 Before 10.0.19045.4046 Affected

Microsoft Windows 11 version 21H2 Before 10.0.22000.2777 Affected

Microsoft Windows 11 version 22H2 Before 10.0.22621.3155 Affected

Microsoft Windows 11 version 22H3 Before 10.0.22631.3155 Affected

Microsoft Windows 11 Version 23H2 Before 10.0.22631.3155 Affected

Microsoft Windows Server 2016 Before 10.0.14393.6709 Affected

Microsoft Windows Server 2019 Before 10.0.17763.5458 Affected

Microsoft Windows Server 2022 Before 10.0.20348.2322 Affected

View vendor advisory

Published: 13 Feb 2024
Exploitation Reported: 13 Feb 2024
Attack vector: Remote
Complexity: Low
Privileges: None
User interaction: Required

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2024-21351
Windows SmartScreen Security Feature Bypass Vulnerability msrc.microsoft.com · Vendor Advisory https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21351

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 13 Feb 2024

Independent exploitation attestation added to the KEV Intelligence record.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

Learn about Pro API access

Source	Added
CISA First	2024-02-13 00:00 UTC
CVE	2026-08-10 15:32 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets: 0
User-Agents: 0

Raw values available in Pro and Enterprise.

Scanner coverage

Nessus template detected 02 Jun 2025.

View Nessus template

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner	Reference	Detected
Nessus	https://www.tenable.com/plugins/nessus/190492	02 Jun 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.6 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

EPSS

30.3%

Weaknesses

Improper Control of Generation of Code ('Code Injection') CWE-94

Timeline

From disclosure to observed exploitation

10 Aug 2026
KEV confirmed by CVE

Exploitation attested by an external source
02 Jun 2025
Nessus plugin available

Scanner coverage available
13 Feb 2024
CVE published

Vulnerability disclosed publicly
13 Feb 2024
Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
08 Dec 2023
CVE ID reserved

Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

View Pro pricing Read API docs

Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2024-21351

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2024-21351",
  "confidence": "Confirmed",
  "cvss_score": 7.6,
  "cvss_estimated": false,
  "epss_score": 0.30344,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

CVE-2024-21351