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Fencer Vulns
high 8.8

CVE-2025-55234 in the critical feed json

Windows SMB Elevation of Privilege Vulnerability

published 2025-09-09 13 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-27294

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
20.8%
EPSS 20.8% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

SMB Server might be susceptible to relay attacks depending on the configuration. An attacker who successfully exploited these vulnerabilities could perform relay attacks and make the users subject to elevation of privilege attacks. The SMB Server already supports mechanisms for hardening against relay attacks:

SMB Server signing SMB Server Extended Protection for Authentication (EPA)

Microsoft is releasing this CVE to provide customers with audit capabilities to help them to assess their environment and to identify any potential device or software incompatibility issues before deploying SMB Server hardening measures that protect against relay attacks. If you have not already enabled SMB Server hardening measures, we advise customers to take the following actions to be protected from these relay attacks:

Assess your environment by utilizing the audit capabilities that we are exposing in the September 2025 security updates. See Support for Audit Events to deploy SMB Server Hardening—SMB Server Signing & SMB Server EPA. Adopt appropriate SMB Server hardening measures.

Patch / fix

  • Microsoft Windows 10 Version 1507 10.0.10240.21128
  • Microsoft Windows 10 Version 1607 10.0.14393.8422
  • Microsoft Windows 10 Version 1809 10.0.17763.7792
  • Microsoft Windows 10 Version 21H2 10.0.19044.6332
  • Microsoft Windows 10 Version 22H2 10.0.19045.6332
  • Microsoft Windows 11 version 22H2 10.0.22621.5909
  • Microsoft Windows 11 version 22H3 10.0.22631.5909
  • Microsoft Windows 11 Version 23H2 10.0.22631.5909
  • Microsoft Windows 11 Version 24H2 10.0.26100.6584
  • Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.27929
  • Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.27929
  • Microsoft Windows Server 2008 Service Pack 2 6.0.6003.23529
  • Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.23529
  • Microsoft Windows Server 2012 6.2.9200.25675
  • Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.25675
  • Microsoft Windows Server 2012 R2 6.3.9600.22774
  • Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.22774
  • Microsoft Windows Server 2016 10.0.14393.8422
  • Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.8422
  • Microsoft Windows Server 2019 10.0.17763.7792
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.7792
  • Microsoft Windows Server 2022 10.0.20348.4171
  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1849
  • Microsoft Windows Server 2025 10.0.26100.6584
  • Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.6584

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
13 mo ago

Exploit prediction

20.76% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Microsoft Windows 10 Version 1507
  • Microsoft Windows 10 Version 1607
  • Microsoft Windows 10 Version 1809
  • Microsoft Windows 10 Version 21H2
  • Microsoft Windows 10 Version 22H2
  • Microsoft Windows 11 version 22H2
  • Microsoft Windows 11 version 22H3
  • Microsoft Windows 11 Version 23H2
  • Microsoft Windows 11 Version 24H2
  • Microsoft Windows Server 2008 R2 Service Pack 1
  • Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation)
  • Microsoft Windows Server 2008 Service Pack 2
  • Microsoft Windows Server 2008 Service Pack 2 (Server Core installation)
  • Microsoft Windows Server 2012
  • Microsoft Windows Server 2012 (Server Core installation)
  • Microsoft Windows Server 2012 R2
  • Microsoft Windows Server 2012 R2 (Server Core installation)
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2016 (Server Core installation)
  • Microsoft Windows Server 2019
  • Microsoft Windows Server 2019 (Server Core installation)
  • Microsoft Windows Server 2022
  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
  • Microsoft Windows Server 2025
  • Microsoft Windows Server 2025 (Server Core installation)

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.