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Fencer Intel
medium 6.8

CVE-2025-49751 json

Windows Hyper-V Denial of Service Vulnerability

published last yr. modified 4mo ago also EUVD-2025-24379

cvss
6.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

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

Patch / fix

  • Microsoft Windows 10 Version 1607 10.0.14393.8330
  • Microsoft Windows 10 Version 1809 10.0.17763.7678
  • Microsoft Windows 10 Version 21H2 10.0.19044.6216
  • Microsoft Windows 10 Version 22H2 10.0.19045.6216
  • Microsoft Windows 11 version 22H2 10.0.22621.5768
  • Microsoft Windows 11 version 22H3 10.0.22631.5768
  • Microsoft Windows 11 Version 23H2 10.0.22631.5768
  • Microsoft Windows 11 Version 24H2 10.0.26100.4946
  • Microsoft Windows Server 2016 10.0.14393.8330
  • Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.8330
  • Microsoft Windows Server 2019 10.0.17763.7678
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.7678
  • Microsoft Windows Server 2022 10.0.20348.4052
  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1791
  • Microsoft Windows Server 2025 10.0.26100.4946
  • Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.4946

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
last yr.

Exploit prediction

0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 6.8 CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C
CNA 3.1 6.8 CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Affected products

  • Microsoft Windows 10 Version 1607
  • Microsoft Windows 10 Version 1809
  • Microsoft Windows 10 Version 21H2
  • Microsoft Windows 10 Version 22H2
  • Microsoft Windows 11 version 22H2
  • Microsoft Windows 11 version 22H3
  • Microsoft Windows 11 Version 23H2
  • Microsoft Windows 11 Version 24H2
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2016 (Server Core installation)
  • Microsoft Windows Server 2019
  • Microsoft Windows Server 2019 (Server Core installation)
  • Microsoft Windows Server 2022
  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
  • Microsoft Windows Server 2025
  • Microsoft Windows Server 2025 (Server Core installation)

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.