CVE-2021-28476 in the critical feed json
Windows Hyper-V Remote Code Execution Vulnerability
published 2021-05-11 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-15154
- cvss
- 9.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 39.2%
- EPSS 39.2% chance of exploitation in 30 days, percentile 98%
- public exploits
- 0
- none known
Summary
Windows Hyper-V Remote Code Execution Vulnerability
Patch / fix
- Microsoft Windows 10 Version 1803 10.0.17134.2207
- Microsoft Windows 10 Version 1809 10.0.17763.1935
- Microsoft Windows Server 2019 10.0.17763.1935
- Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.1935
- Microsoft Windows 10 Version 1909 10.0.18363.1556
- Microsoft Windows Server, version 1909 (Server Core installation) 10.0.18363.1556
- Microsoft Windows 10 Version 2004 10.0.19041.982
- Microsoft Windows Server version 2004 10.0.19041.982
- Microsoft Windows Server version 20H2 10.0.19042.982
- Microsoft Windows 10 Version 1507 10.0.10240.18931
- Microsoft Windows 10 Version 1607 10.0.14393.4401
- Microsoft Windows Server 2016 10.0.14393.4401
- Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.4401
- Microsoft Windows 7 Service Pack 1 6.1.7601.24597, 6.1.7601.24598
- Microsoft Windows 8.1 6.3.9600.20017
- Microsoft Windows Server 2008 Service Pack 2 6.0.6003.21117
- Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.21117
- Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.24597, 6.1.7601.24598
- Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.24597, 6.1.7601.24598
- Microsoft Windows Server 2012 6.2.9200.23347
- Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.23347
- Microsoft Windows Server 2012 R2 6.3.9600.20017
- Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.20017
Exploit prediction
39.23% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C |
| CNA | 3.1 | 9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| NVD | 2.0 | 6.5 | AV:N/AC:L/Au:S/C:P/I:P/A:P |
Affected products
- Microsoft Windows 10 Version 1803
- Microsoft Windows 10 Version 1809
- Microsoft Windows Server 2019
- Microsoft Windows Server 2019 (Server Core installation)
- Microsoft Windows 10 Version 1909
- Microsoft Windows Server, version 1909 (Server Core installation)
- Microsoft Windows 10 Version 2004
- Microsoft Windows Server version 2004
- Microsoft Windows Server version 20H2
- Microsoft Windows 10 Version 1507
- Microsoft Windows 10 Version 1607
- Microsoft Windows Server 2016
- Microsoft Windows Server 2016 (Server Core installation)
- Microsoft Windows 7 Service Pack 1
- Microsoft Windows 8.1
- Microsoft Windows Server 2008 Service Pack 2
- Microsoft Windows Server 2008 Service Pack 2 (Server Core installation)
- Microsoft Windows Server 2008 R2 Service Pack 1
- Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation)
- Microsoft Windows Server 2012
- Microsoft Windows Server 2012 (Server Core installation)
- Microsoft Windows Server 2012 R2
- Microsoft Windows Server 2012 R2 (Server Core installation)
References
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-28476
patch, vendor-advisory
-
packetstormsecurity.com
/files/163497/Microsoft-Hyper-V-vmswitch.sys-Proof-Of-Concept.html
third-party-advisory, vdb-entry
Sources
- CVE List CVE-2021-28476
- NVD CVE-2021-28476
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.