CVE-2021-28476

mediumpriority · attend · 50EPSS 0.392 · 99 %ileexploit · PoCEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

5 exploits · PoC

Likely / severe?

39.2% (99th) EPSS

CVSS 6.5 · medium

Is it mine?

68 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · fstec_bdu

EPSS · scored 2026-10-27

Windows Hyper-V Remote Code Execution Vulnerability

cvss

Technical severity, 0–10. One row per scoring source.

9.9

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 6.5–9.9

v2.06.5mediumAV:N/AC:L/Au:S/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8 · impact 6.4

v2.06.5mediumAV:N/AC:L/Au:S/C:P/I:P/A:P/E:Hsecondary · CVSS-BT (t0sche)

v3.19.9criticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:Hsecondary · NVD / NIST USexploitability 3.1 · impact 6

v3.19.9criticalAV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19.9criticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · ENISA EU

v3.19.9criticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:Hsecondary · secure@microsoft.com USexploitability 3.1 · impact 6

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-94US

exploits (5)

Public proof-of-concept and weaponised exploit code.

0vercl0k/CVE-2021-28476PoC for CVE-2021-28476 a guest-to-host "Hyper-V Remote Code Execution Vulnerability" in vmswitch.sys.PoC · poc_in_github
LaCeeKa/CVE-2021-28476-tools-envtools for automate configure Ubuntu 20.04 enviroment for testing CVE-2021-28476.PoC · poc_in_github
australeo/CVE-2021-28476CVE-2021-28476: Hyper-V vmswitch.sys arbitrary pointer dereference from guest VMPoC · poc_in_github
bluefrostsecurity/CVE-2021-28476bluefrostsecurity/CVE-2021-28476PoC · poc_in_github
dengyang123x/0vercl0kPoC for CVE-2021-28476 a guest-to-host "Hyper-V Remote Code Execution Vulnerability" in vmswitch.sys.PoC · poc_in_github

affected products (68)

Products and version ranges known to be affected.

Microsoft Windows 10 Version 150710.0.0 → 10.0.10240.18931enisa_euvdEU
Microsoft Windows 10 Version 160710.0.0 → 10.0.14393.4401enisa_euvdEU
Microsoft Windows 10 Version 180310.0.0 → 10.0.17134.2207enisa_euvdEU
Microsoft Windows 10 Version 180910.0.0 → 10.0.17763.1935enisa_euvdEU
Microsoft Windows 10 Version 190910.0.0 → 10.0.18363.1556enisa_euvdEU
Microsoft Windows 10 Version 200410.0.0 → 10.0.19041.982enisa_euvdEU
Microsoft Windows 7 Service Pack 16.1.0 → 6.1.7601.24597enisa_euvdEU
Microsoft Windows 7 Service Pack 16.1.0 → 6.1.7601.24598enisa_euvdEU
Microsoft Windows 8.16.3.0 → 6.3.9600.20017enisa_euvdEU
Microsoft Windows Server 2008 R2 Service Pack 16.1.0 → 6.1.7601.24597enisa_euvdEU
Microsoft Windows Server 2008 R2 Service Pack 16.1.0 → 6.1.7601.24598enisa_euvdEU
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation)6.0.0 → 6.1.7601.24597enisa_euvdEU
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation)6.0.0 → 6.1.7601.24598enisa_euvdEU
Microsoft Windows Server 2008 Service Pack 26.0.0 → 6.0.6003.21117enisa_euvdEU
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation)6.0.0 → 6.0.6003.21117enisa_euvdEU
Microsoft Windows Server 20126.2.0 → 6.2.9200.23347enisa_euvdEU
Microsoft Windows Server 2012 (Server Core installation)6.2.0 → 6.2.9200.23347enisa_euvdEU
Microsoft Windows Server 2012 R26.3.0 → 6.3.9600.20017enisa_euvdEU
Microsoft Windows Server 2012 R2 (Server Core installation)6.3.0 → 6.3.9600.20017enisa_euvdEU
Microsoft Windows Server 201610.0.0 → 10.0.14393.4401enisa_euvdEU

showing 20 of 68

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu NVD CVE.org MITRE

published 2021-05-11modified 2026-06-17

references (9)

External citations — patches, advisories, analysis.

scry

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