Medium 6.5Known exploited (CISA KEV)Published Nov 12, 2024

CVE-2024-43451NTLM Hash Disclosure Spoofing Vulnerability

Updated under an hour ago (Oct 27, 2026, 3:00 AM ET)

Does this affect you?

It affects Microsoft Windows Server 2025 and 20 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Nov 12, 2024; federal agencies had to remediate by Dec 3, 2024. Treat that date as your deadline.

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Every CVE for Microsoft Windows Server 2025

Exploited in the last 30 days

NTLM Hash Disclosure Spoofing Vulnerability

CVSS: 6.5 MEDIUM (v3.1, CNA)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
Weakness (CWE): CWE-73
Known exploited: Added to CISA KEV Nov 12, 2024; federal remediation due Dec 3, 2024Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 84.27% (percentile 100)
Assigned by: microsoft
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Microsoft Windows Server 2025 microsoft:windows_server_2025 (from the name)	from 10.0.26100.0 before 10.0.26100.2314	CNA record
Microsoft Windows 10 Version 1809 microsoft:windows_10_1809	from 10.0.17763.0 before 10.0.17763.6532	CNA record
Microsoft Windows Server 2019 microsoft:windows_server_2019 (from the name)	from 10.0.17763.0 before 10.0.17763.6532	CNA record
Microsoft Windows Server 2022 microsoft:windows_server_2022 (from the name)	from 10.0.20348.0 before 10.0.20348.2849	CNA record
Microsoft Windows 10 Version 21H2 microsoft:windows_10_21h2	from 10.0.19043.0 before 10.0.19044.5131	CNA record
Microsoft Windows 11 version 22H2 microsoft:windows_11_22h2	from 10.0.22621.0 before 10.0.22621.4460	CNA record
Microsoft Windows 10 Version 22H2 microsoft:windows_10_22h2	from 10.0.19045.0 before 10.0.19045.5131	CNA record
Microsoft Windows 11 version 22H3 microsoft:windows_11_22h3	from 10.0.22631.0 before 10.0.22631.4460	CNA record
Microsoft Windows 11 Version 23H2 microsoft:windows_11_23h2	from 10.0.22631.0 before 10.0.22631.4460	CNA record
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) microsoft:windows_server_2022_23h2	from 10.0.25398.0 before 10.0.25398.1251	CNA record
1–10 of 34

References

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-43451	vendor-advisory, patch
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-43451	us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.