CVE-2021-42274
Status: ModifiedMedium (6.5)—
Windows Hyper-V Discrete Device Assignment (DDA) Denial of Service Vulnerability
CVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
- Base score: 6.5
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 0.69%
- Percentile among all scored CVEs: 52
- Score date: 10/15/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (5)
CWEs
- NVD-CWE-noinfo
References
Raw JSON (NVD)
Show
{
"id": "CVE-2021-42274",
"cveTags": [],
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"accessVector": "LOCAL",
"vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:P",
"authentication": "NONE",
"integrityImpact": "NONE",
"accessComplexity": "LOW",
"availabilityImpact": "PARTIAL",
"confidentialityImpact": "NONE"
},
"acInsufInfo": false,
"impactScore": 2.9,
"baseSeverity": "LOW",
"obtainAllPrivilege": false,
"exploitabilityScore": 3.9,
"obtainUserPrivilege": false,
"obtainOtherPrivilege": false,
"userInteractionRequired": false
}
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"cvssMetricV31": [
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"integrityImpact": "NONE",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
"integrityImpact": "NONE",
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"availabilityImpact": "HIGH",
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}
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},
{
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},
{
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{
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],
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},
{
"vendor": "Microsoft",
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}
],
"platforms": [
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}
],
"published": "2021-11-10T01:19:43.317",
"references": [
{
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42274",
"source": "secure@microsoft.com"
},
{
"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42274",
"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 Discrete Device Assignment (DDA) Denial of Service Vulnerability"
},
{
"lang": "es",
"value": "Una vulnerabilidad de denegación de servicio en Windows Hyper-V Discrete Device Assignment (DDA)"
}
],
"lastModified": "2026-08-19T17:17:57.770",
"configurations": [
{
"nodes": [
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"sourceIdentifier": "secure@microsoft.com"
}