CVE tracker / CVE-2025-62567

CVE-2025-62567

CVE-2025-62567 is the Windows Hyper-V Denial of Service Vulnerability. Microsoft rates it Important, CVSS 5.3. It is not in CISA's Known Exploited Vulnerabilities catalog. Published December 9, 2025.

Risk summary

MediumDenial of Service

5.3

CVSS v3 base

1.1%

EPSS: chance of exploitation in 30 days

Medium

Severity

Important

Microsoft's rating

Unlikely

Microsoft: exploitation

In CISA KEV

Microsoft describes it: “Integer underflow (wrap or wraparound) in Windows Hyper-V allows an authorized attacker to deny service over a network.”

How to fix it

Microsoft lists 21 affected products and the update that fixes each:

KB5071417 · fixed build 10.0.22631.6345
Windows 11 Version 23H2 for x64-based Systems, Windows 11 Version 23H2 for ARM64-based Systems
KB5071503 · fixed build 6.3.9600.22920
Windows Server 2012 R2 (Server Core installation), Windows Server 2012 R2
KB5071542 · fixed build 10.0.25398.2025
Windows Server 2022, 23H2 Edition (Server Core installation)
KB5071543 · fixed build 10.0.14393.8688
Windows Server 2016 (Server Core installation), Windows Server 2016, Windows 10 Version 1607 for x64-based Systems
KB5071544 · fixed build 10.0.17763.8146
Windows Server 2019 (Server Core installation), Windows Server 2019, Windows 10 Version 1809 for x64-based Systems
KB5071546 · fixed build 10.0.19045.6691, 10.0.19044.6691
Windows 10 Version 22H2 for x64-based Systems, Windows 10 Version 21H2 for x64-based Systems
KB5071547 · fixed build 10.0.20348.4529
Windows Server 2022 (Server Core installation), Windows Server 2022
KB5072033 · fixed build 10.0.26100.7462, 10.0.26200.7462
Windows Server 2025, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, and 1 more

What Microsoft changed

December 9, 2025: Information published.

Details

Weakness: CWE-191: Integer Underflow (Wrap or Wraparound)
Publicly disclosed (Microsoft): No
Exploited (Microsoft): No
Known exploited (CISA KEV): Not listed
Published: December 9, 2025
Last revised: December 9, 2025

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References

Microsoft Security Update Guide NVD CVE record CWE

From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.