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Fencer Intel
critical 9.0

CVE-2021-40461 json

Windows Hyper-V Remote Code Execution Vulnerability

published 5y ago modified 4mo ago also EUVD-2021-27638

cvss
9.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

Windows Hyper-V Remote Code Execution Vulnerability

Patch / fix

  • Microsoft Windows 10 Version 1809 10.0.17763.2237
  • Microsoft Windows Server 2019 10.0.17763.2237
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.2237
  • Microsoft Windows 10 Version 1909 10.0.18363.1854
  • Microsoft Windows 10 Version 21H1 10.0.19043.1288
  • Microsoft Windows Server 2022 10.0.20348.288
  • Microsoft Windows 10 Version 2004 10.0.19041.1288
  • Microsoft Windows Server version 2004 10.0.19041.1288
  • Microsoft Windows Server version 20H2 10.0.19042.1288
  • Microsoft Windows 11 version 21H2 10.0.22000.258

Is CVE-2021-40461 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

1.36% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 8.0 CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA 3.1 8.0 CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CNA 3.1 9.0 CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NVD 2.0 5.2 AV:A/AC:L/Au:S/C:P/I:P/A:P

Affected products

  • Microsoft Windows 10 Version 1809
  • Microsoft Windows Server 2019
  • Microsoft Windows Server 2019 (Server Core installation)
  • Microsoft Windows 10 Version 1909
  • Microsoft Windows 10 Version 21H1
  • Microsoft Windows Server 2022
  • Microsoft Windows 10 Version 2004
  • Microsoft Windows Server version 2004
  • Microsoft Windows Server version 20H2
  • Microsoft Windows 11 version 21H2

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.