CVE-2021-26867

Windows Hyper-V Remote Code Execution Vulnerability

CVSS v3 9.9 CRITICAL
CVSS v2.0 7.2 HIGH

9.9^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.1 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

7.2^/10

CVSS v2.0 : HIGH

Vector : AV:L/AC:L/Au:N/C:C/I:C/A:C

Exploitability : 3.9 / Impact : 10.0

Access Vector LOCAL

Access Complexity LOW

Authentication NONE

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26867
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26867	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:microsoft:windows_10:20h2::::::x64:
	cpe:2.3:o:microsoft:windows_10:1909::::::x64:
	cpe:2.3:o:microsoft:windows_10:2004::::::x64:
	cpe:2.3:o:microsoft:windows_server_2016:20h2:::::::*
	cpe:2.3:o:microsoft:windows_server_2016:1909:::::::*
	cpe:2.3:o:microsoft:windows_server_2016:2004:::::::*

History

No history.

Information

Published : 2021-03-11 16:15

Updated : 2026-08-19 17:17

NVD link : CVE-2021-26867

Mitre link : CVE-2021-26867

CVE.ORG link : CVE-2021-26867

JSON object : View

Products Affected

microsoft

windows_10
windows_server_2016

CWE

NVD-CWE-noinfo

{"id": "CVE-2021-26867", "cveTags": [], "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 7.2, "accessVector": "LOCAL", "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "authentication": "NONE", "integrityImpact": "COMPLETE", "accessComplexity": "LOW", "availabilityImpact": "COMPLETE", "confidentialityImpact": "COMPLETE"}, "acInsufInfo": false, "impactScore": 10.0, "baseSeverity": "HIGH", "obtainAllPrivilege": false, "exploitabilityScore": 3.9, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Secondary", "source": "secure@microsoft.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 9.9, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 3.1}, {"type": "Secondary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 2.0}]}, "affected": [{"source": "secure@microsoft.com", "affectedData": [{"vendor": "Microsoft", "product": "Windows 10 Version 1909", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "10.0.18363.1440", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows 10 Version 2004", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "10.0.19043.867", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows Server version 2004", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "10.0.19043.867", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows Server version 20H2", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "10.0.19043.867", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows Server, version 1909 (Server Core installation)", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "10.0.18363.1440", "versionType": "custom"}], "platforms": ["x64-based Systems"]}]}], "published": "2021-03-11T16:15:14.503", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26867", "source": "secure@microsoft.com"}, {"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26867", "tags": ["Patch", "Vendor Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "Windows Hyper-V Remote Code Execution Vulnerability"}, {"lang": "es", "value": "Una Vulnerabilidad de Ejecuci\u00f3n de C\u00f3digo Remota de Windows Hyper-V"}], "lastModified": "2026-08-19T17:17:40.590", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:x64:*", "vulnerable": true, "matchCriteriaId": "21074553-EDF2-468D-8E79-C39851B5BC79"}, {"criteria": "cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:x64:*", "vulnerable": true, "matchCriteriaId": "61F0792D-7587-4297-8EE7-D4DC3A30EE84"}, {"criteria": "cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:x64:*", "vulnerable": true, "matchCriteriaId": "09D9A720-8D3C-4699-AC57-CB4531E5BFEB"}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2016:20h2:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4A190388-AA82-4504-9D5A-624F23268C9F"}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2016:1909:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C253A63F-03AB-41CB-A03A-B2674DEA98AA"}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2016:2004:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0B60D940-80C7-49F0-8F4E-3F99AC15FA82"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com"}