FKIE_CVE-2026-21247
Vulnerability from fkie_nvd - Published: 2026-02-10 18:16 - Updated: 2026-06-17 10:18
Severity
Summary
Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally.
References
| URL | Tags | ||
|---|---|---|---|
| secure@microsoft.com | https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21247 | Vendor Advisory |
Impacted products
{
"affected": [
{
"affectedData": [
{
"platforms": [
"x64-based Systems"
],
"product": "Windows 10 Version 1607",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.14393.8868",
"status": "affected",
"version": "10.0.14393.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"x64-based Systems"
],
"product": "Windows 10 Version 1809",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.17763.8389",
"status": "affected",
"version": "10.0.17763.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"x64-based Systems"
],
"product": "Windows 10 Version 21H2",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.19044.6937",
"status": "affected",
"version": "10.0.19044.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"x64-based Systems"
],
"product": "Windows 10 Version 22H2",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.19045.6937",
"status": "affected",
"version": "10.0.19045.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"ARM64-based Systems"
],
"product": "Windows 11 version 22H3",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.22631.6649",
"status": "affected",
"version": "10.0.22631.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"x64-based Systems"
],
"product": "Windows 11 Version 23H2",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.22631.6649",
"status": "affected",
"version": "10.0.22631.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"ARM64-based Systems",
"x64-based Systems"
],
"product": "Windows 11 Version 24H2",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.26100.7840",
"status": "affected",
"version": "10.0.26100.0",
"versionType": "custom"
}
]
},
{
"product": "Windows 11 Version 25H2",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.26200.7840",
"status": "affected",
"version": "10.0.26200.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"ARM64-based Systems"
],
"product": "Windows 11 version 26H1",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.28000.1575",
"status": "affected",
"version": "10.0.28000.0",
"versionType": "custom"
}
]
},
{
"product": "Windows 11 Version 26H1",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.28000.1575",
"status": "affected",
"version": "10.0.28000.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"x64-based Systems"
],
"product": "Windows Server 2016",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.14393.8868",
"status": "affected",
"version": "10.0.14393.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"x64-based Systems"
],
"product": "Windows Server 2016 (Server Core installation)",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.14393.8868",
"status": "affected",
"version": "10.0.14393.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"x64-based Systems"
],
"product": "Windows Server 2019",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.17763.8389",
"status": "affected",
"version": "10.0.17763.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"x64-based Systems"
],
"product": "Windows Server 2019 (Server Core installation)",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.17763.8389",
"status": "affected",
"version": "10.0.17763.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"x64-based Systems"
],
"product": "Windows Server 2022",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.20348.4773",
"status": "affected",
"version": "10.0.20348.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"x64-based Systems"
],
"product": "Windows Server 2022, 23H2 Edition (Server Core installation)",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.25398.2149",
"status": "affected",
"version": "10.0.25398.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"x64-based Systems"
],
"product": "Windows Server 2025",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.26100.32370",
"status": "affected",
"version": "10.0.26100.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"x64-based Systems"
],
"product": "Windows Server 2025 (Server Core installation)",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.26100.32370",
"status": "affected",
"version": "10.0.26100.0",
"versionType": "custom"
}
]
}
],
"source": "secure@microsoft.com"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*",
"matchCriteriaId": "E78A20FD-B910-43DF-BE89-E971E2FD0049",
"versionEndExcluding": "10.0.14393.8868",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*",
"matchCriteriaId": "C09C54DA-6AB0-4696-A2F2-C11CFC292EA9",
"versionEndExcluding": "10.0.17763.8389",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*",
"matchCriteriaId": "893DBA65-116B-4AE0-80E1-50458CB5FDAD",
"versionEndExcluding": "10.0.19044.6937",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*",
"matchCriteriaId": "F54B0C64-9A1F-470B-9824-322CF362507F",
"versionEndExcluding": "10.0.19045.6937",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*",
"matchCriteriaId": "B273EF5A-3157-4842-AE91-CEC289813902",
"versionEndExcluding": "10.0.22631.6649",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*",
"matchCriteriaId": "CD2513FC-D399-4DBF-921F-13B4D1497127",
"versionEndExcluding": "10.0.22631.6649",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*",
"matchCriteriaId": "B08450A0-0F7E-4A05-8989-900221992766",
"versionEndExcluding": "10.0.26100.7781",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*",
"matchCriteriaId": "9D30B348-DAE7-43EC-85FA-38E1715258A9",
"versionEndExcluding": "10.0.26100.7781",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*",
"matchCriteriaId": "8F23FFCF-9C69-4D27-AF21-D09A6041AA3A",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*",
"matchCriteriaId": "D1D93202-BDDB-438F-934E-1FE904B3651B",
"versionEndExcluding": "10.0.26200.7781",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*",
"matchCriteriaId": "E21BC97D-1C11-41FD-9A20-34A2BC535BD9",
"versionEndExcluding": "10.0.14393.8868",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*",
"matchCriteriaId": "B6E3E93E-8160-4BFB-B5CB-85740922CF7E",
"versionEndExcluding": "10.0.17763.8389",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*",
"matchCriteriaId": "9E19FC4B-C3CC-4924-9A0B-5E4F100280D4",
"versionEndExcluding": "10.0.20348.4711",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "10.0.25398.2149",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*",
"matchCriteriaId": "33AF95F4-504F-40EF-9F64-5D6F7B40114F",
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"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally."
},
{
"lang": "es",
"value": "Validaci\u00f3n de entrada incorrecta en Windows Hyper-V permite a un atacante autorizado ejecutar c\u00f3digo localmente."
}
],
"id": "CVE-2026-21247",
"lastModified": "2026-06-17T10:18:21.463",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.3,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.3,
"impactScore": 5.9,
"source": "secure@microsoft.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-21247",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-02-11T04:55:52.161047Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-02-10T18:16:26.180",
"references": [
{
"source": "secure@microsoft.com",
"tags": [
"Vendor Advisory"
],
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21247"
}
],
"sourceIdentifier": "secure@microsoft.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-20"
},
{
"lang": "en",
"value": "CWE-122"
},
{
"lang": "en",
"value": "CWE-125"
}
],
"source": "secure@microsoft.com",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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