CVE-2025-59280: Windows SMB Client Tampering Vulnerability

Severity: low (CVSS 3.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-14 · updated 2026-06-17
Weakness: CWE-287

Description

Improper authentication in Windows SMB Client allows an unauthorized attacker to perform tampering over a network.

Affected products

Microsoft Windows 10 Version 1507: before 10.0.10240.21161 — fixed in 10.0.10240.21161
Microsoft Windows 10 1607: before 10.0.14393.8519 — fixed in 10.0.14393.8519
Microsoft Windows 10: before 10.0.17763.7919 — fixed in 10.0.17763.7919
Microsoft Windows 10: before 10.0.19044.6456 — fixed in 10.0.19044.6456
Microsoft Windows 10: before 10.0.19045.6456 — fixed in 10.0.19045.6456
Microsoft Windows 11: before 10.0.22621.6060 — fixed in 10.0.22621.6060
Microsoft Windows 11: through 10.0.22631.6060
Microsoft Windows 11: before 10.0.26100.6899 — fixed in 10.0.26100.6899
Microsoft Windows Server 2008: r2-sp1
Microsoft Windows Server 2012: r2
Microsoft Windows Server 2016: through 10.0.14393.8519
Microsoft Windows Server 2019: before 10.0.17763.7919 — fixed in 10.0.17763.7919
Microsoft Windows Server 2022: before 10.0.20348.4294 — fixed in 10.0.20348.4294
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.1913 — fixed in 10.0.25398.1913
Microsoft Windows Server 2025: through 10.0.26100.6899
Microsoft Windows 10 Version 1507: from 10.0.10240.0 before 10.0.10240.21161 — fixed in 10.0.10240.21161
Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.8519 — fixed in 10.0.14393.8519
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.7919 — fixed in 10.0.17763.7919
Microsoft Windows 10: from 10.0.19044.0 before 10.0.19044.6456 — fixed in 10.0.19044.6456
Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.6456 — fixed in 10.0.19045.6456
Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.6060 — fixed in 10.0.22621.6060
Microsoft Windows 11 version 22H3: from 10.0.22631.0 before 10.0.22631.6060 — fixed in 10.0.22631.6060
Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.6060 — fixed in 10.0.22631.6060
Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.6899 — fixed in 10.0.26100.6899
Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0 before 6.1.7601.27974 — fixed in 6.1.7601.27974
Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0 before 6.0.6003.23571 — fixed in 6.0.6003.23571
Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.25722 — fixed in 6.2.9200.25722
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.22824 — fixed in 6.3.9600.22824
Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.8519 — fixed in 10.0.14393.8519
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.7919 — fixed in 10.0.17763.7919

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.21161; Microsoft Windows 10 1607 10.0.14393.8519; Microsoft Windows 10 10.0.17763.7919; Microsoft Windows 10 10.0.19044.6456; Microsoft Windows 10 10.0.19045.6456; Microsoft Windows 11 10.0.22621.6060; Microsoft Windows 11 10.0.26100.6899; Microsoft Windows Server 2019 10.0.17763.7919; Microsoft Windows Server 2022 10.0.20348.4294; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1913; Microsoft Windows 10 Version 1507 10.0.10240.21161; Microsoft Windows 10 1607 10.0.14393.8519. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59280

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