Vulnerability report

Exploitation Attempts Observed in the Wild Confirmed Confidence In CISA KEV

CVE-2024-43451

NTLM Hash Disclosure Spoofing Vulnerability

Microsoft / Windows Server 2025 · affected before 10.0.26100.2314

Watch CVE-2024-43451 Browse KEV feed
Severity
CVSS 6.5 · Medium
Confidence
Confirmed
Exploit status
Exploitation Attempts Observed in the Wild
EPSS
84.3%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2024-43451 is an unauthenticated NTLM Hash Disclosure Spoofing Vulnerability affecting Microsoft Windows Server 2025 and 24 other products.

Have exploitation attempts been observed?

Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Listed in CISA KEV. Confidence is confirmed.

Who is affected?

Microsoft / Windows Server 2025 affected before 10.0.26100.2314.

What should we do?

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

Overview

NTLM Hash Disclosure Spoofing Vulnerability

NTLM Hash Disclosure Spoofing Vulnerability

Microsoft Affected
Windows Server 2025
Before 10.0.26100.2314
Microsoft Affected
Windows Server 2025 (Server Core installation)
Before 10.0.26100.2314
Microsoft Affected
Windows 10 Version 1809
Before 10.0.17763.6532
Microsoft Affected
Windows Server 2019
Before 10.0.17763.6532
Microsoft Affected
Windows Server 2019 (Server Core installation)
Before 10.0.17763.6532
Microsoft Affected
Windows Server 2022
Before 10.0.20348.2849
Microsoft Affected
Windows 10 Version 21H2
Before 10.0.19044.5131
Microsoft Affected
Windows 11 version 22H2
Before 10.0.22621.4460
Microsoft Affected
Windows 10 Version 22H2
Before 10.0.19045.5131
Microsoft Affected
Windows 11 version 22H3
Before 10.0.22631.4460
Microsoft Affected
Windows 11 Version 23H2
Before 10.0.22631.4460
Microsoft Affected
Windows Server 2022, 23H2 Edition (Server Core installation)
Before 10.0.25398.1251
Microsoft Affected
Windows 11 Version 24H2
Before 10.0.26100.2314
Microsoft Affected
Windows 10 Version 1507
Before 10.0.10240.20826
Microsoft Affected
Windows 10 Version 1607
Before 10.0.14393.7515
Microsoft Affected
Windows Server 2016
Before 10.0.14393.7515
Microsoft Affected
Windows Server 2016 (Server Core installation)
Before 10.0.14393.7515
Microsoft Affected
Windows Server 2008 Service Pack 2
Before 6.0.6003.22966
Microsoft Affected
Windows Server 2008 Service Pack 2 (Server Core installation)
Before 6.0.6003.22966
Microsoft Affected
Windows Server 2008 Service Pack 2
Before 6.0.6003.22966
Microsoft Affected
Windows Server 2008 R2 Service Pack 1
Before 6.1.7601.27415
Microsoft Affected
Windows Server 2008 R2 Service Pack 1 (Server Core installation)
Before 6.1.7601.27415
Microsoft Affected
Windows Server 2012 R2
Before 6.3.9600.22267
Microsoft Affected
Windows Server 2012 R2 (Server Core installation)
Before 6.3.9600.22267
View vendor advisory (opens in new tab)
Published
12 Nov 2024
Exploitation Attempts Reported
12 Nov 2024
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
Required

Tags

windows nessus_scanner cisa microsoft

CVE References

Exploitation evidence

Evidence of exploitation attempts

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

Exploitation Attempts Observed in the Wild

CISA

Recorded 12 Nov 2024

A trusted third party reported exploitation attempts.

Known exploited vulnerability sources

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

Learn about Pro API access
Source Added
CISA First 2024-11-12 00:00 UTC

Detection

Operational artifacts and observed signals

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

Virtual patch status

No Previdian 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/210866 02 Jun 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

6.5 Medium

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C

EPSS

84.3%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

External Control of File Name or Path CWE-73

Timeline

From disclosure to observed exploitation attempts

  1. 09:26 UTC

    Nessus plugin available

    Scanner coverage available

  2. 17:53 UTC

    CVE published

    Vulnerability disclosed publicly

  3. 00:00 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  4. 01:08 UTC

    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.

Start 14-day Pro trial 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-2024-43451

Sample API response 
{
  "cve_id": "CVE-2024-43451",
  "confidence": "Confirmed",
  "cvss_score": 6.5,
  "cvss_estimated": false,
  "epss_score": 0.84266,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}