CVE-2025-53778
HighWindows NTLM Elevation of Privilege Vulnerability
Published Aug 12, 2025 · Updated Feb 26, 2026
Key Facts
Patch immediately- CVE-2025-53778 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Windows 10 1507 (Microsoft), Windows 10 1607 (Microsoft), Windows 10 1809 (Microsoft) and 22 more products.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 51% probability of exploitation in the next 30 days.
- Fixed versions are available, including Windows 10 1507 10.0.10240.21100, Windows 10 1607 10.0.14393.8330, Windows 10 1809 10.0.17763.7678.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
51%
Higher than 98.9% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2025-53778 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Improper authentication in Windows NTLM allows an authorized attacker to elevate privileges over a network.
Affected Products
46 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 10 1507Microsoft | See advisory | 10.0.10240.21100 |
| Windows 10 1607Microsoft | See advisory | 10.0.14393.8330 |
| Windows 10 1809Microsoft | See advisory | 10.0.17763.7678 |
| Windows 10 21h2Microsoft | See advisory | 10.0.19044.6216 |
| Windows 10 22h2Microsoft | See advisory | 10.0.19045.6216 |
Patched Releases
Windows 10 1507
10.0.10240.21100
Windows 10 1607
10.0.14393.8330
Windows 10 1809
10.0.17763.7678
Windows 10 21h2
10.0.19044.6216
Windows 10 22h2
10.0.19045.6216
Windows 11 22h2
10.0.22621.5768
Windows 11 23h2
10.0.22631.5768
Windows 11 24h2
10.0.26100.4851
Windows Server 2016
10.0.14393.8330
Windows Server 2019
10.0.17763.7678
Windows Server 2022
10.0.20348.3989, 10.0.20348.4052
Windows Server 2022 23h2
10.0.25398.1791
Windows Server 2025
10.0.26100.4851, 10.0.26100.4946
Windows 10 Version 1507
10.0.10240.21100
Windows 10 Version 1607
10.0.14393.8330
Windows 10 Version 1809
10.0.17763.7678
Windows 10 Version 21H2
10.0.19044.6216
Windows 10 Version 22H2
10.0.19045.6216
Windows 11 version 22H2
10.0.22621.5768
Windows 11 version 22H3
10.0.22631.5768
Windows 11 Version 23H2
10.0.22631.5768
Windows 11 Version 24H2
10.0.26100.4946
Windows Server 2008 R2 Service Pack 1
6.1.7601.27872
Windows Server 2008 R2 Service Pack 1 (Server Core installation)
6.1.7601.27872
Windows Server 2008 Service Pack 2
6.0.6003.23471
Timeline
Publicly disclosed
Aug 12, 2025
Last updated
Feb 26, 2026
Weakness Type
- CWE-287 Improper Authentication
References
- advisoryWindows NTLM Elevation of Privilege Vulnerability
- otherhttps://www.vicarius.io/vsociety/posts/cve-2025-53778-detection-script-improper-authentication-vulnerability-affecting-windows-ntlm
- otherhttps://www.vicarius.io/vsociety/posts/cve-2025-53778-mitigation-script-improper-authentication-vulnerability-affecting-windows-ntlm
FAQ
Common Questions.
Improper authentication in Windows NTLM allows an authorized attacker to elevate privileges over a network.
Affected: Windows 10 1507 (Microsoft); Windows 10 1607 (Microsoft); Windows 10 1809 (Microsoft), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Windows 10 1507 10.0.10240.21100, Windows 10 1607 10.0.14393.8330, Windows 10 1809 10.0.17763.7678.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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