CVE tracker / CVE-2025-47999

CVE-2025-47999

CVE-2025-47999 is the Windows Hyper-V Denial of Service Vulnerability. Microsoft rates it Important, CVSS 6.8. It is not in CISA's Known Exploited Vulnerabilities catalog. Published July 8, 2025.

Risk summary

MediumDenial of Service

6.8

CVSS v3 base

0.5%

EPSS: chance of exploitation in 30 days

Medium

Severity

Important

Microsoft's rating

Less Likely

Microsoft: exploitation

In CISA KEV

Microsoft describes it: “Missing synchronization in Windows Hyper-V allows an authorized attacker to deny service over an adjacent network.”

How to fix it

Microsoft lists 19 affected products and the update that fixes each:

KB5062552 · fixed build 10.0.22631.5624, 10.0.22621.5624
Windows 11 Version 23H2 for x64-based Systems, Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 22H2 for x64-based Systems, Windows 11 Version 22H2 for ARM64-based Systems
KB5062553 · fixed build 10.0.26100.4652
Windows Server 2025, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems, Windows Server 2025 (Server Core installation)
KB5062554 · fixed build 10.0.19045.6093, 10.0.19044.6093
Windows 10 Version 22H2 for x64-based Systems, Windows 10 Version 21H2 for x64-based Systems
KB5062557 · fixed build 10.0.17763.7558
Windows Server 2019 (Server Core installation), Windows Server 2019, Windows 10 Version 1809 for x64-based Systems
KB5062560 · fixed build 10.0.14393.8246
Windows Server 2016 (Server Core installation), Windows Server 2016, Windows 10 Version 1607 for x64-based Systems
KB5062570 · fixed build 10.0.25398.1732
Windows Server 2022, 23H2 Edition (Server Core installation)
KB5062572 · fixed build 10.0.20348.3932
Windows Server 2022 (Server Core installation), Windows Server 2022

What Microsoft changed

July 8, 2025: Information published.

Details

Weakness: CWE-820: Missing Synchronization
Publicly disclosed (Microsoft): No
Exploited (Microsoft): No
Known exploited (CISA KEV): Not listed
Published: July 8, 2025
Last revised: July 8, 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.