CVE-2021-1703

Estado: ModificadaAlta (7.8)—

Una Vulnerabilidad de Elevación de Privilegios del Windows Event Logging Service

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: 0.81%
Percentil entre todas las CVEs puntuadas: 56
Fecha de la puntuación: 15/10/2026

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).

Tecnologías afectadas (2)

Microsoft — Windows 10 Microsoft — Windows Server 2016

CWE

CWE-269

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2021-1703",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "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,
        "baseSeverity": "HIGH",
        "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",
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          "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"
        },
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        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "secure@microsoft.com",
      "affectedData": [
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            "cpe:2.3:o:microsoft:windows_10_20H2:*:*:*:*:*:*:x86:*",
            "cpe:2.3:o:microsoft:windows_10_20H2:*:*:*:*:*:*:arm64:*"
          ],
          "vendor": "Microsoft",
          "product": "Windows 10 Version 20H2",
          "versions": [
            {
              "status": "affected",
              "version": "10.0.0",
              "lessThan": "publication",
              "versionType": "custom"
            }
          ],
          "platforms": [
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            "ARM64-based Systems"
          ]
        },
        {
          "cpes": [
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          "vendor": "Microsoft",
          "product": "Windows Server version 20H2",
          "versions": [
            {
              "status": "affected",
              "version": "10.0.0",
              "lessThan": "publication",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "x64-based Systems"
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*"
          ],
          "vendor": "Microsoft",
          "product": "Windows 10 Version 2004",
          "versions": [
            {
              "status": "affected",
              "version": "10.0.0",
              "lessThan": "publication",
              "versionType": "custom"
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          ],
          "platforms": [
            "32-bit Systems",
            "ARM64-based Systems",
            "x64-based Systems"
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_2004:*:*:*:*:*:*:*:*"
          ],
          "vendor": "Microsoft",
          "product": "Windows Server version 2004",
          "versions": [
            {
              "status": "affected",
              "version": "10.0.0",
              "lessThan": "publication",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "x64-based Systems"
          ]
        }
      ]
    }
  ],
  "published": "2021-01-12T20:15:33.993",
  "references": [
    {
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1703",
      "source": "secure@microsoft.com"
    },
    {
      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1703",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-269"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Windows Event Logging Service Elevation of Privilege Vulnerability"
    },
    {
      "lang": "es",
      "value": "Una Vulnerabilidad de Elevación de Privilegios del Windows Event Logging Service"
    }
  ],
  "lastModified": "2026-06-17T03:32:23.957",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9E2C378B-1507-4C81-82F6-9F599616845A"
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "AAE74AF3-C559-4645-A6C0-25C3D647AAC8"
            },
            {
              "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_2016:2004:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0B60D940-80C7-49F0-8F4E-3F99AC15FA82"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "secure@microsoft.com"
}