CVE-2018-8438

Estado: ModificadaMedia (6.8)—

Existe una vulnerabilidad de denegación de servicio cuando Microsoft Hyper-V Network Switch, en un servidor host valida incorrectamente entradas de un usuario privilegiado en un sistema operativo invitado. Esto también se conoce como "Windows Hyper-V Denial of Service Vulnerability". Esto afecta a Windows Server 2012 R2, Windows RT 8.1, Windows Server 2016, Windows 8.1, Windows 10 y Windows 10 Servers. El ID de este CVE es diferente de CVE-2018-8436 y CVE-2018-8437.

CVSS

Versión: 3.0
Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
Puntuación base: 6.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 7.17%
Percentil entre todas las CVEs puntuadas: 94
Fecha de la puntuación: 10/10/2026

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 (4)

Microsoft — Windows 10 Microsoft — Windows 8.1 Microsoft — Windows Server Microsoft — Windows Server 2016

CWE

CWE-20

Referencias

JSON original (NVD)

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{
  "id": "CVE-2018-8438",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 6.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:N/I:N/A:C",
          "authentication": "SINGLE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 6.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.0",
          "baseScore": 6.8,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 4,
        "exploitabilityScore": 2.3
      }
    ]
  },
  "affected": [
    {
      "source": "secure@microsoft.com",
      "affectedData": [
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2012 R2",
          "versions": [
            {
              "status": "affected",
              "version": "(Server Core installation)"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows RT 8.1",
          "versions": [
            {
              "status": "affected",
              "version": "Windows RT 8.1"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2016",
          "versions": [
            {
              "status": "affected",
              "version": "(Server Core installation)"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows 8.1",
          "versions": [
            {
              "status": "affected",
              "version": "32-bit systems"
            },
            {
              "status": "affected",
              "version": "x64-based systems"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows 10",
          "versions": [
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              "status": "affected",
              "version": "32-bit Systems"
            },
            {
              "status": "affected",
              "version": "Version 1607 for 32-bit Systems"
            },
            {
              "status": "affected",
              "version": "Version 1607 for x64-based Systems"
            },
            {
              "status": "affected",
              "version": "Version 1703 for 32-bit Systems"
            },
            {
              "status": "affected",
              "version": "Version 1703 for x64-based Systems"
            },
            {
              "status": "affected",
              "version": "Version 1709 for 32-bit Systems"
            },
            {
              "status": "affected",
              "version": "Version 1709 for x64-based Systems"
            },
            {
              "status": "affected",
              "version": "Version 1803 for 32-bit Systems"
            },
            {
              "status": "affected",
              "version": "Version 1803 for x64-based Systems"
            },
            {
              "status": "affected",
              "version": "x64-based Systems"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows 10 Servers",
          "versions": [
            {
              "status": "affected",
              "version": "version 1709  (Server Core Installation)"
            },
            {
              "status": "affected",
              "version": "version 1803  (Server Core Installation)"
            }
          ]
        }
      ]
    }
  ],
  "published": "2018-09-13T00:29:04.100",
  "references": [
    {
      "url": "http://www.securityfocus.com/bid/105249",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "secure@microsoft.com"
    },
    {
      "url": "http://www.securitytracker.com/id/1041624",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "secure@microsoft.com"
    },
    {
      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8438",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "secure@microsoft.com"
    },
    {
      "url": "http://www.securityfocus.com/bid/105249",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securitytracker.com/id/1041624",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8438",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A denial of service vulnerability exists when Microsoft Hyper-V Network Switch on a host server fails to properly validate input from a privileged user on a guest operating system, aka \"Windows Hyper-V Denial of Service Vulnerability.\" This affects Windows Server 2012 R2, Windows RT 8.1, Windows Server 2016, Windows 8.1, Windows 10, Windows 10 Servers. This CVE ID is unique from CVE-2018-8436, CVE-2018-8437."
    },
    {
      "lang": "es",
      "value": "Existe una vulnerabilidad de denegación de servicio cuando Microsoft Hyper-V Network Switch, en un servidor host valida incorrectamente entradas de un usuario privilegiado en un sistema operativo invitado. Esto también se conoce como \"Windows Hyper-V Denial of Service Vulnerability\". Esto afecta a Windows Server 2012 R2, Windows RT 8.1, Windows Server 2016, Windows 8.1, Windows 10 y Windows 10 Servers. El ID de este CVE es diferente de CVE-2018-8436 y CVE-2018-8437."
    }
  ],
  "lastModified": "2026-06-17T02:04:52.367",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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            },
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            },
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              "matchCriteriaId": "7CB85C75-4D35-480E-843D-60579EC75FCB"
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            },
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              "vulnerable": true,
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          ],
          "operator": "OR"
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  ],
  "sourceIdentifier": "secure@microsoft.com"
}