CVE-2025-62455: Microsoft Message Queuing (MSMQ) Elevation of Privilege Vulnerability

Severity: high (CVSS 7.8 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: 2025-12-09 · updated 2026-09-25
Weakness: CWE-20

Description

Improper input validation in Windows Message Queuing allows an authorized attacker to elevate privileges locally.

Affected products

Microsoft Windows 10 1607: before 10.0.14393.8688 — fixed in 10.0.14393.8688
Microsoft Windows 10: before 10.0.17763.8146 — fixed in 10.0.17763.8146
Microsoft Windows 10: before 10.0.19044.6691 — fixed in 10.0.19044.6691
Microsoft Windows 10: before 10.0.19045.6691 — fixed in 10.0.19045.6691
Microsoft Windows Server 2008: r2-sp1
Microsoft Windows Server 2012: r2
Microsoft Windows Server 2016: before 10.0.14393.8688 — fixed in 10.0.14393.8688
Microsoft Windows Server 2019: before 10.0.17763.8146 — fixed in 10.0.17763.8146
Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.8688 — fixed in 10.0.14393.8688
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.8146 — fixed in 10.0.17763.8146
Microsoft Windows 10: from 10.0.19044.0 before 10.0.19044.6691 — fixed in 10.0.19044.6691
Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.6691 — fixed in 10.0.19045.6691
Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0 before 6.1.7601.28064 — fixed in 6.1.7601.28064
Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0 before 6.0.6003.23666 — fixed in 6.0.6003.23666
Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.25815 — fixed in 6.2.9200.25815
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.22920 — fixed in 6.3.9600.22920
Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.8688 — fixed in 10.0.14393.8688
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.8146 — fixed in 10.0.17763.8146

How to fix

Upgrade to a fixed version: Microsoft Windows 10 1607 10.0.14393.8688; Microsoft Windows 10 10.0.17763.8146; Microsoft Windows 10 10.0.19044.6691; Microsoft Windows 10 10.0.19045.6691; Microsoft Windows Server 2016 10.0.14393.8688; Microsoft Windows Server 2019 10.0.17763.8146; Microsoft Windows 10 1607 10.0.14393.8688; Microsoft Windows 10 10.0.17763.8146; Microsoft Windows 10 10.0.19044.6691; Microsoft Windows 10 10.0.19045.6691; Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.28064; Microsoft Windows Server 2008 Service Pack 2 6.0.6003.23666. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62455

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