CVE-2025-62567: Windows Hyper-V Denial of Service Vulnerability

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-12-09 · updated 2026-06-17
Weakness: CWE-191

Description

Integer underflow (wrap or wraparound) in Windows Hyper-V allows an authorized attacker to deny service over a network.

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 11: before 10.0.22631.6345 — fixed in 10.0.22631.6345
Microsoft Windows 11: before 10.0.26100.7392 — fixed in 10.0.26100.7392
Microsoft Windows 11 25H2: before 10.0.26200.7392 — fixed in 10.0.26200.7392
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 Server 2022: before 10.0.20348.4467 — fixed in 10.0.20348.4467
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.2025 — fixed in 10.0.25398.2025
Microsoft Windows Server 2025: before 10.0.26100.7392 — fixed in 10.0.26100.7392
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 11 version 22H3: from 10.0.22631.0 before 10.0.22631.6345 — fixed in 10.0.22631.6345
Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.6345 — fixed in 10.0.22631.6345
Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.7462 — fixed in 10.0.26100.7462
Microsoft Windows 11 25H2: from 10.0.26200.0 before 10.0.26200.7462 — fixed in 10.0.26200.7462
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
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.4529 — fixed in 10.0.20348.4529
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0 before 10.0.25398.2025 — fixed in 10.0.25398.2025
Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.7462 — fixed in 10.0.26100.7462

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 11 10.0.22631.6345; Microsoft Windows 11 10.0.26100.7392; Microsoft Windows 11 25H2 10.0.26200.7392; Microsoft Windows Server 2016 10.0.14393.8688; Microsoft Windows Server 2019 10.0.17763.8146; Microsoft Windows Server 2022 10.0.20348.4467; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2025; Microsoft Windows Server 2025 10.0.26100.7392. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62567

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