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CVE-2025-54101: Windows SMB Client Remote Code Execution Vulnerability

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-09 · updated 2026-06-17
• Weakness: CWE-416

Description

Use after free in Windows SMBv3 Client allows an authorized attacker to execute code over a network.

Affected products

• Microsoft Windows 10 Version 1507: before 10.0.10240.21128 — fixed in 10.0.10240.21128
• Microsoft Windows 10 1607: before 10.0.14393.8422 — fixed in 10.0.14393.8422
• Microsoft Windows 10: before 10.0.17763.7792 — fixed in 10.0.17763.7792
• Microsoft Windows 10: before 10.0.19044.6332 — fixed in 10.0.19044.6332
• Microsoft Windows 10: before 10.0.19045.6332 — fixed in 10.0.19045.6332
• Microsoft Windows 11: before 10.0.22621.5909 — fixed in 10.0.22621.5909
• Microsoft Windows 11: before 10.0.22631.5909 — fixed in 10.0.22631.5909
• Microsoft Windows Server 2012: r2
• Microsoft Windows Server 2016: before 10.0.14393.8422 — fixed in 10.0.14393.8422
• Microsoft Windows Server 2019: before 10.0.17763.7792 — fixed in 10.0.17763.7792
• Microsoft Windows Server 2022: before 10.0.20348.4106 — fixed in 10.0.20348.4106
• Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.1849 — fixed in 10.0.25398.1849
• Microsoft Windows 10 Version 1507: from 10.0.10240.0 before 10.0.10240.21128 — fixed in 10.0.10240.21128
• Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.8422 — fixed in 10.0.14393.8422
• Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.7792 — fixed in 10.0.17763.7792
• Microsoft Windows 10: from 10.0.19044.0 before 10.0.19044.6332 — fixed in 10.0.19044.6332
• Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.6332 — fixed in 10.0.19045.6332
• Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.5909 — fixed in 10.0.22621.5909
• Microsoft Windows 11 version 22H3: from 10.0.22631.0 before 10.0.22631.5909 — fixed in 10.0.22631.5909
• Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.5909 — fixed in 10.0.22631.5909
• Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.25675 — fixed in 6.2.9200.25675
• Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.22774 — fixed in 6.3.9600.22774
• Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.8422 — fixed in 10.0.14393.8422
• Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.7792 — fixed in 10.0.17763.7792
• Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.4171 — fixed in 10.0.20348.4171
• Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0 before 10.0.25398.1849 — fixed in 10.0.25398.1849

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.21128; Microsoft Windows 10 1607 10.0.14393.8422; Microsoft Windows 10 10.0.17763.7792; Microsoft Windows 10 10.0.19044.6332; Microsoft Windows 10 10.0.19045.6332; Microsoft Windows 11 10.0.22621.5909; Microsoft Windows 11 10.0.22631.5909; Microsoft Windows Server 2016 10.0.14393.8422; Microsoft Windows Server 2019 10.0.17763.7792; Microsoft Windows Server 2022 10.0.20348.4106; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1849; Microsoft Windows 10 Version 1507 10.0.10240.21128. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-54101
• https://www.vicarius.io/vsociety/posts/cve-2025-54101-detection-script-remote-code-execution-vulnerability-affecting-windows-smbv3
• https://www.vicarius.io/vsociety/posts/cve-2025-54101-mitigation-script-remote-code-execution-vulnerability-affecting-windows-smbv3

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