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High severity8.8NVD Advisory· Published Sep 9, 2025· Updated Jun 17, 2026

CVE-2025-55234

CVE-2025-55234

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

47
  • Microsoft/Windows 10 19093 versions
    cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x64:*+ 2 more
    • cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x64:*range: <10.0.10240.21128
    • cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x86:*range: <10.0.10240.21128
    • (no CPE)range: 10.0.10240.0
  • Microsoft/Windows 10 16077 versions
    cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*+ 6 more
    • cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*range: <10.0.14393.8422
    • cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*range: <10.0.14393.8422
    • cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*range: <10.0.19044.6332
    • cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*range: <10.0.19045.6332
    • (no CPE)range: 10.0.14393.0
    • (no CPE)range: 10.0.19044.0
    • (no CPE)range: 10.0.19045.0
  • Microsoft/Windows 10 18093 versions
    cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*+ 2 more
    • cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*range: <10.0.17763.7792
    • cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*range: <10.0.17763.7792
    • (no CPE)range: 10.0.17763.0
  • Microsoft/Windows 11 23h24 versions
    cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:*:*+ 3 more
    • cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:*:*range: <10.0.22621.5909
    • cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*range: <10.0.22631.5909
    • (no CPE)range: 10.0.22621.0
    • (no CPE)range: 10.0.22631.0
  • Microsoft/Windows 11 24h22 versions
    cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*range: <10.0.26100.6508
    • (no CPE)range: 10.0.26100.0
  • Microsoft/Windows Server 20085 versions
    cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x64:*+ 4 more
    • cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x64:*
    • cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x86:*
    • cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
    • (no CPE)range: 6.1.7601.0
    • (no CPE)range: 6.0.6003.0
  • Microsoft/Windows Server 20125 versions
    cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*+ 4 more
    • cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
    • cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
    • cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*range: <10.0.25398.1849
    • (no CPE)range: 6.2.9200.0
    • (no CPE)range: 6.3.9600.0
  • Microsoft/Windows Server 20162 versions
    cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*range: <10.0.14393.8422
    • (no CPE)range: 10.0.14393.0
  • Microsoft/Windows Server 20192 versions
    cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*range: <10.0.17763.7792
    • (no CPE)range: 10.0.17763.0
  • Microsoft/Windows Server 20032 versions
    cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*range: <10.0.20348.4106
    • (no CPE)range: 10.0.20348.0
  • Microsoft/Windows Server 20252 versions
    cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*range: <10.0.26100.6508
    • (no CPE)range: 10.0.26100.0
  • Microsoft/SMB Serverllm-create
  • Microsoft/Windows 10 version 1607cpe-rescue
    Range: 10.0.22631.0
  • Microsoft/Windows Server 2008 R2 Service Pack 1 (Server Core installation)v5
    Range: 6.1.7601.0
  • Microsoft/Windows Server 2008 Service Pack 2 (Server Core installation)v5
    Range: 6.0.6003.0
  • Microsoft/Windows Server 2012 (Server Core installation)v5
    Range: 6.2.9200.0
  • Microsoft/Windows Server 2012 R2 (Server Core installation)v5
    Range: 6.3.9600.0
  • Microsoft/Windows Server 2016 (Server Core installation)v5
    Range: 10.0.14393.0
  • Microsoft/Windows Server 2019 (Server Core installation)v5
    Range: 10.0.17763.0
  • Microsoft/Windows Server 2022, 23H2 Edition (Server Core installation)v5
    Range: 10.0.25398.0
  • Microsoft/Windows Server 2025 (Server Core installation)v5
    Range: 10.0.26100.0

Patches

Vulnerability mechanics

References

3

News mentions

0

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