Is CVE-2025-49751 in the CISA KEV catalog?

No. CVE-2025-49751 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-49751?

CVE-2025-49751 has a CVSS v3 base score of 6.8 (MEDIUM).

What is the EPSS score for CVE-2025-49751?

CVE-2025-49751 has an EPSS score of 0.43% (34th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-49751?

Install KB5063871 for Windows 10 Version 1607. Fixes are available for 16 affected products.

CVE & CISA-KEV Catalog

CVE-2025-49751

MEDIUM

6.8

CVSS v3

NVD

Description

Missing synchronization in Windows Hyper-V allows an authorized attacker to deny service over an adjacent network.

CWE-820

How to fix

Remediation Available

Windows 10 Version 1607Windows

Install:KB5063871Microsoft

Windows 10 Version 1809Windows

Install:KB5063877Microsoft

Windows 10 Version 21H2Windows

Install:KB5063709Microsoft

Windows 10 Version 22H2Windows

Install:KB5063709Microsoft

Windows 11 Version 22H2Windows

Install:KB5063875Microsoft

Windows 11 Version 23H2Windows

Install:KB5063875Microsoft

Windows 11 Version 24H2Windows

Install:KB5063878Microsoft

Install:KB5064010Microsoft

Windows Server 2016Windows

Install:KB5063871Microsoft

Windows Server 2016 (Server Core installation)Windows

Install:KB5063871Microsoft

Windows Server 2019Windows

Install:KB5063877Microsoft

Windows Server 2019 (Server Core installation)Windows

Install:KB5063877Microsoft

Windows Server 2022Windows

Install:KB5063812Microsoft

Install:KB5063880Microsoft

Windows Server 2022 (Server Core installation)Windows

Install:KB5063812Microsoft

Install:KB5063880Microsoft

Windows Server 2022, 23H2 Edition (Server Core installation)Windows

Install:KB5063899Microsoft

Windows Server 2025Windows

Install:KB5064010Microsoft

Install:KB5063878Microsoft

Windows Server 2025 (Server Core installation)Windows

Install:KB5064010Microsoft

Install:KB5063878Microsoft

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorAdjacent

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Exploit Intelligence

0.43%probability of exploitation in 30 days

34thpercentile

Low risk: more likely to be exploited than 34% of all known CVEs.

References

Vendor Advisory1

msrc.microsoft.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-08-15.