CVE-2021-40450
Estado: AnalizadaAlta (7.8)⚠ Explotación activa
Win32k Elevation of Privilege Vulnerability
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 1.58%
- Percentil entre todas las CVEs puntuadas: 75
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
CISA KEV — explotada activamente
- Añadida al catálogo: 25/4/2022
- Plazo de remediación: 16/5/2022
- Uso conocido en ransomware: Unknown
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation95 % - Impacto secundario
T1083File and Directory Discoverydiscovery75 %
Vulnerabilidad local de Win32k con vector AV:L/PR:L permite escalada de privilegios (T1068). Desde privilegios elevados se logra ejecución de comandos (T1059.001), manipulación de control de acceso (T1548.002) y acceso a archivos del sistema (T1083). Impactos C:H/I:H/A:H confirmados.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (10)
CWE
- NVD-CWE-noinfo
Referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2021-40450",
"cveTags": [],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2021-40450",
"role": "CISA Coordinator",
"options": [
{
"exploitation": "active"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"version": "2.0.3",
"timestamp": "2025-02-04T19:34:09.939626Z"
}
}
],
"cvssMetricV2": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"version": "2.0",
"baseScore": 4.6,
"accessVector": "LOCAL",
"vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P",
"authentication": "NONE",
"integrityImpact": "PARTIAL",
"accessComplexity": "LOW",
"availabilityImpact": "PARTIAL",
"confidentialityImpact": "PARTIAL"
},
"acInsufInfo": false,
"impactScore": 6.4,
"baseSeverity": "MEDIUM",
"obtainAllPrivilege": false,
"exploitabilityScore": 3.9,
"obtainUserPrivilege": false,
"obtainOtherPrivilege": false,
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"type": "Secondary",
"source": "secure@microsoft.com",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.8,
"attackVector": "LOCAL",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 1.8
},
{
"type": "Secondary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.8,
"attackVector": "LOCAL",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 1.8
}
]
},
"affected": [
{
"source": "secure@microsoft.com",
"affectedData": [
{
"cpes": [
"cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2237:*:*:*:*:*:x86:*",
"cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2237:*:*:*:*:*:x64:*",
"cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2237:*:*:*:*:*:arm64:*"
],
"vendor": "Microsoft",
"product": "Windows 10 Version 1809",
"versions": [
{
"status": "affected",
"version": "10.0.0",
"lessThan": "10.0.17763.2237",
"versionType": "custom"
}
],
"platforms": [
"32-bit Systems",
"x64-based Systems",
"ARM64-based Systems"
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2237:*:*:*:*:*:*:*"
],
"vendor": "Microsoft",
"product": "Windows Server 2019",
"versions": [
{
"status": "affected",
"version": "10.0.0",
"lessThan": "10.0.17763.2237",
"versionType": "custom"
}
],
"platforms": [
"x64-based Systems"
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2237:*:*:*:*:*:*:*"
],
"vendor": "Microsoft",
"product": "Windows Server 2019 (Server Core installation)",
"versions": [
{
"status": "affected",
"version": "10.0.0",
"lessThan": "10.0.17763.2237",
"versionType": "custom"
}
],
"platforms": [
"x64-based Systems"
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1854:*:*:*:*:*:x86:*",
"cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1854:*:*:*:*:*:x64:*",
"cpe:2.3:o:microsoft:windows_10_1809:10.0.18363.1854:*:*:*:*:*:x64:*"
],
"vendor": "Microsoft",
"product": "Windows 10 Version 1909",
"versions": [
{
"status": "affected",
"version": "10.0.0",
"lessThan": "10.0.18363.1854",
"versionType": "custom"
}
],
"platforms": [
"32-bit Systems",
"x64-based Systems",
"ARM64-based Systems"
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1288:*:*:*:*:*:x64:*",
"cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1288:*:*:*:*:*:arm64:*",
"cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1288:*:*:*:*:*:x86:*"
],
"vendor": "Microsoft",
"product": "Windows 10 Version 21H1",
"versions": [
{
"status": "affected",
"version": "10.0.0",
"lessThan": "10.0.19043.1288",
"versionType": "custom"
}
],
"platforms": [
"x64-based Systems",
"ARM64-based Systems",
"32-bit Systems"
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_server_2022:10.0.20348.288:*:*:*:*:*:*:*"
],
"vendor": "Microsoft",
"product": "Windows Server 2022",
"versions": [
{
"status": "affected",
"version": "10.0.0",
"lessThan": "10.0.20348.288",
"versionType": "custom"
}
],
"platforms": [
"x64-based Systems"
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_10_1809:10.0.19041.1288:*:*:*:*:*:x64:*"
],
"vendor": "Microsoft",
"product": "Windows 10 Version 2004",
"versions": [
{
"status": "affected",
"version": "10.0.0",
"lessThan": "10.0.19041.1288",
"versionType": "custom"
}
],
"platforms": [
"32-bit Systems",
"ARM64-based Systems",
"x64-based Systems"
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_server_2004:10.0.19041.1288:*:*:*:*:*:*:*"
],
"vendor": "Microsoft",
"product": "Windows Server version 2004",
"versions": [
{
"status": "affected",
"version": "10.0.0",
"lessThan": "10.0.19041.1288",
"versionType": "custom"
}
],
"platforms": [
"x64-based Systems"
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1288:*:*:*:*:*:x86:*",
"cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1288:*:*:*:*:*:arm64:*"
],
"vendor": "Microsoft",
"product": "Windows 10 Version 20H2",
"versions": [
{
"status": "affected",
"version": "10.0.0",
"lessThan": "10.0.19042.1288",
"versionType": "custom"
}
],
"platforms": [
"32-bit Systems",
"ARM64-based Systems"
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_server_20H2:10.0.19042.1288:*:*:*:*:*:*:*"
],
"vendor": "Microsoft",
"product": "Windows Server version 20H2",
"versions": [
{
"status": "affected",
"version": "10.0.0",
"lessThan": "10.0.19042.1288",
"versionType": "custom"
}
],
"platforms": [
"x64-based Systems"
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_11_21H2:10.0.22000.258:*:*:*:*:*:x64:*",
"cpe:2.3:o:microsoft:windows_11_21H2:10.0.22000.258:*:*:*:*:*:arm64:*"
],
"vendor": "Microsoft",
"product": "Windows 11 version 21H2",
"versions": [
{
"status": "affected",
"version": "10.0.0",
"lessThan": "10.0.22000.258",
"versionType": "custom"
}
],
"platforms": [
"x64-based Systems",
"ARM64-based Systems"
]
}
]
}
],
"published": "2021-10-13T01:15:09.750",
"references": [
{
"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40450",
"tags": [
"Patch",
"Vendor Advisory"
],
"source": "secure@microsoft.com"
},
{
"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40450",
"tags": [
"Patch",
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40450",
"tags": [
"US Government Resource"
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
}
],
"vulnStatus": "Analyzed",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Win32k Elevation of Privilege Vulnerability"
},
{
"lang": "es",
"value": "Una vulnerabilidad de Elevación de Privilegios en Win32k . Este ID de CVE es diferente de CVE-2021-40449, CVE-2021-41357"
}
],
"lastModified": "2026-06-17T04:06:56.627",
"cisaActionDue": "2022-05-16",
"cisaExploitAdd": "2022-04-25",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "D03564D3-788A-4BD7-B717-B3681515A5BE",
"versionEndExcluding": "10.0.17763.2237"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "2DFF53D4-2910-4A58-81DF-6DDC01D2C523",
"versionEndExcluding": "10.0.18363.1854"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "C995398E-B786-4AC7-B6D4-790ED8C68F8C",
"versionEndExcluding": "10.0.19041.1288"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "129B19A3-40D5-48D4-B3CA-8934062E6933",
"versionEndExcluding": "10.0.19042.1288"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_21h1:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "D78C68AE-C471-4234-B0D0-7E09D2E131AB",
"versionEndExcluding": "10.0.19043.1288"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_11_21h2:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "2FF279C0-02C7-4D60-85E8-9FB89492D738",
"versionEndExcluding": "10.0.22000.258"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2004:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "486E7F23-6A3B-46AA-9F31-91EDF933B36A",
"versionEndExcluding": "10.0.19041.1288"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "A555704D-BB77-46A3-A0F9-62409FCC5F40",
"versionEndExcluding": "10.0.17763.2237"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "6E5F3F99-530D-4065-9133-9C251F89B406",
"versionEndExcluding": "10.0.20348.288"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_20h2:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "224FA1B7-84EF-435F-BBFA-33BD39C32595",
"versionEndExcluding": "10.0.19042.1288"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "secure@microsoft.com",
"cisaRequiredAction": "Apply updates per vendor instructions.",
"cisaVulnerabilityName": "Microsoft Win32k Privilege Escalation Vulnerability"
}