CVE-2021-42284 json
Windows Hyper-V Denial of Service Vulnerability
published 2021-11-10 4 y ago modified 2026-08-19 2 mo ago also EUVD-2021-29259
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.8%
- EPSS 3.8% chance of exploitation in 30 days, percentile 89%
- public exploits
- 0
- none known
Summary
Windows Hyper-V Denial of Service Vulnerability
Patch / fix
- Microsoft Windows 10 Version 1507 10.0.10240.19119
- Microsoft Windows 10 Version 1607 10.0.14393.4770
- Microsoft Windows 10 Version 1809 10.0.17763.2300
- Microsoft Windows 10 Version 1909 10.0.18363.1916
- Microsoft Windows 10 Version 2004 10.0.19041.1348
- Microsoft Windows 10 Version 21H1 10.0.19043.1348
- Microsoft Windows 11 version 21H2 10.0.22000.318
- Microsoft Windows 8.1 6.3.9600.20174
- Microsoft Windows Server 2012 R2 6.3.9600.20174
- Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.20174
- Microsoft Windows Server 2016 10.0.14393.4770
- Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.4770
- Microsoft Windows Server 2019 10.0.17763.2300
- Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.2300
- Microsoft Windows Server 2022 10.0.20348.350
- Microsoft Windows Server version 2004 10.0.19041.1348
- Microsoft Windows Server version 20H2 10.0.19041.1348
Exploit prediction
3.76% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).
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:P/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 |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 7.1 | AV:N/AC:M/Au:N/C:N/I:N/A:C |
Affected products
- Microsoft Windows 10 Version 1507
- Microsoft Windows 10 Version 1607
- Microsoft Windows 10 Version 1809
- Microsoft Windows 10 Version 1909
- Microsoft Windows 10 Version 2004
- Microsoft Windows 10 Version 21H1
- Microsoft Windows 11 version 21H2
- Microsoft Windows 8.1
- Microsoft Windows Server 2012 R2
- Microsoft Windows Server 2012 R2 (Server Core installation)
- 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 version 2004
- Microsoft Windows Server version 20H2
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2021-42284
vendor-advisory, patch
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-42284
patch, vendor-advisory
Sources
- CVE List CVE-2021-42284
- NVD CVE-2021-42284
Fencer Vulns 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.