CVE-2025-50166: Windows Distributed Transaction Coordinator (MSDTC) Information Disclosure Vulnerability

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-08-12 · updated 2026-06-17
Weakness: CWE-190

Description

Integer overflow or wraparound in Windows Distributed Transaction Coordinator allows an authorized attacker to disclose information over a network.

Affected products

Microsoft Windows 10 Version 1507: before 10.0.10240.21100 — fixed in 10.0.10240.21100
Microsoft Windows 10 1607: before 10.0.14393.8330 — fixed in 10.0.14393.8330
Microsoft Windows 10: before 10.0.17763.7678 — fixed in 10.0.17763.7678
Microsoft Windows 10: before 10.0.19044.6216 — fixed in 10.0.19044.6216
Microsoft Windows 10: before 10.0.19045.6216 — fixed in 10.0.19045.6216
Microsoft Windows 11: before 10.0.22621.5768 — fixed in 10.0.22621.5768
Microsoft Windows 11: before 10.0.22631.5768 — fixed in 10.0.22631.5768
Microsoft Windows 11: before 10.0.26100.4851 — fixed in 10.0.26100.4851
Microsoft Windows Server 2008: r2-sp1
Microsoft Windows Server 2012: r2
Microsoft Windows Server 2016: before 10.0.14393.8330 — fixed in 10.0.14393.8330
Microsoft Windows Server 2019: before 10.0.17763.7678 — fixed in 10.0.17763.7678
Microsoft Windows Server 2022: before 10.0.20348.3989 — fixed in 10.0.20348.3989
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.1791 — fixed in 10.0.25398.1791
Microsoft Windows Server 2025: before 10.0.26100.4851 — fixed in 10.0.26100.4851
Microsoft Windows 10 Version 1507: from 10.0.10240.0 before 10.0.10240.21100 — fixed in 10.0.10240.21100
Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.8330 — fixed in 10.0.14393.8330
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.7678 — fixed in 10.0.17763.7678
Microsoft Windows 10: from 10.0.19044.0 before 10.0.19044.6216 — fixed in 10.0.19044.6216
Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.6216 — fixed in 10.0.19045.6216
Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.5768 — fixed in 10.0.22621.5768
Microsoft Windows 11 version 22H3: from 10.0.22631.0 before 10.0.22631.5768 — fixed in 10.0.22631.5768
Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.5768 — fixed in 10.0.22631.5768
Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.4946 — fixed in 10.0.26100.4946
Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0 before 6.1.7601.27872 — fixed in 6.1.7601.27872
Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0 before 6.0.6003.23471 — fixed in 6.0.6003.23471
Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.25622 — fixed in 6.2.9200.25622
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.22725 — fixed in 6.3.9600.22725
Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.8330 — fixed in 10.0.14393.8330
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.7678 — fixed in 10.0.17763.7678

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.21100; Microsoft Windows 10 1607 10.0.14393.8330; Microsoft Windows 10 10.0.17763.7678; Microsoft Windows 10 10.0.19044.6216; Microsoft Windows 10 10.0.19045.6216; Microsoft Windows 11 10.0.22621.5768; Microsoft Windows 11 10.0.22631.5768; Microsoft Windows 11 10.0.26100.4851; Microsoft Windows Server 2016 10.0.14393.8330; Microsoft Windows Server 2019 10.0.17763.7678; Microsoft Windows Server 2022 10.0.20348.3989; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1791. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-50166

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