CVE-2025-54918: Improper authentication in Windows NTLM allows an authorized attacker to elevate privileges over a network

High severity · published Sep 9, 2025

CVE-2025-54918

Improper authentication in Windows NTLM allows an authorized attacker to elevate privileges over a network

8.8

CVSS

25.3%

EPSS

On KEV

Description

Improper authentication in Windows NTLM allows an authorized attacker to elevate privileges over a network.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack vector

Network

Complexity

Low

Privileges

Low

User interaction

None

Confidentiality

High

Integrity

High

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)25.3% · higher than 98% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Windows 10 1507 · Microsoft

before 10.0.10240.21128; before 10.0.10240.21128 · source: NVD

Windows 10 1607 · Microsoft

before 10.0.14393.8422; before 10.0.14393.8422 · source: NVD

Windows 10 1809 · Microsoft

before 10.0.17763.7792; before 10.0.17763.7792 · source: NVD

Windows 10 21h2 · Microsoft

before 10.0.19044.6332 · source: NVD

Windows 10 22h2 · Microsoft

before 10.0.19045.6332 · source: NVD

Windows 11 22h2 · Microsoft

before 10.0.22621.5909 · source: NVD

Windows 11 23h2 · Microsoft

before 10.0.22631.5909 · source: NVD

Windows 11 24h2 · Microsoft

before 10.0.26100.6508 · source: NVD

Windows Server 2008 · Microsoft

r2 · source: NVD

Windows Server 2012 · Microsoft

r2 · source: NVD

Windows Server 2016 · Microsoft

before 10.0.14393.8422 · source: NVD

Windows Server 2019 · Microsoft

before 10.0.17763.7792 · source: NVD

Affected product

Windows 10 1507

Microsoft

All Windows 10 1507 CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2025-54918

CVE.org

https://www.cve.org/CVERecord?id=CVE-2025-54918

Vendor Advisory

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-54918