CVE-2026-20938

Estado: AnalizadaAlta (7.8)—

Untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.

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: 0.47%
Percentil entre todas las CVEs puntuadas: 39
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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation95 %
Impacto principalT1548 Abuse Elevation Control Mechanismprivilege escalation85 %
Impacto secundarioT1134 Access Token Manipulationstealth · privilege escalation70 %

Acceso local (AV:L) sin interacción del usuario (UI:N) con privilegios requeridos (PR:L) → T1068. Eleva privilegios en VBS Enclave (confidencialidad, integridad y disponibilidad altas). Impactos: escalada de privilegios (T1548) y acceso a procesos del sistema (T1134).

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

User Account Management Privileged Account Management Execution Prevention Update Software Threat Intelligence Program Restrict File and Directory Permissions

Tecnologías afectadas (3)

Microsoft — Windows 11 23h2 Microsoft — Windows 11 24h2 Microsoft — Windows 11 25h2

CWE

CWE-822

Referencias

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20938

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-20938",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-20938",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-01-14T04:55:54.463334Z"
        }
      }
    ],
    "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
      }
    ]
  },
  "affected": [
    {
      "source": "secure@microsoft.com",
      "affectedData": [
        {
          "vendor": "Microsoft",
          "product": "Windows 11 version 23H2",
          "versions": [
            {
              "status": "affected",
              "version": "10.0.22631.0",
              "lessThan": "10.0.22631.6491",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "ARM64-based Systems"
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows 11 Version 23H2",
          "versions": [
            {
              "status": "affected",
              "version": "10.0.22631.0",
              "lessThan": "10.0.22631.6491",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "x64-based Systems"
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows 11 Version 24H2",
          "versions": [
            {
              "status": "affected",
              "version": "10.0.26100.0",
              "lessThan": "10.0.26100.7623",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "ARM64-based Systems",
            "x64-based Systems"
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows 11 Version 25H2",
          "versions": [
            {
              "status": "affected",
              "version": "10.0.26200.0",
              "lessThan": "10.0.26200.7623",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "ARM64-based Systems",
            "x64-based Systems"
          ]
        }
      ]
    }
  ],
  "published": "2026-01-13T18:16:20.980",
  "references": [
    {
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20938",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "secure@microsoft.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secure@microsoft.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-822"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally."
    },
    {
      "lang": "es",
      "value": "Desreferencia de puntero no confiable en el enclave de Seguridad Basada en Virtualización (VBS) de Windows permite a un atacante autorizado elevar privilegios localmente."
    }
  ],
  "lastModified": "2026-07-30T21:17:11.070",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*",
              "vulnerable": true,
              "matchCriteriaId": "7D2B0BB9-E94A-420E-8E53-A4C1136DE73E",
              "versionEndExcluding": "10.0.22631.6491"
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*",
              "vulnerable": true,
              "matchCriteriaId": "78C4B71B-5345-4D83-A0A9-A15F783CF9A9",
              "versionEndExcluding": "10.0.22631.6491"
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*",
              "vulnerable": true,
              "matchCriteriaId": "208734FD-5175-4856-9D08-ED6CFF64AA14",
              "versionEndExcluding": "10.0.26100.7623"
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*",
              "vulnerable": true,
              "matchCriteriaId": "846261D4-ECC2-4DCB-8F8F-F27F8C99F061",
              "versionEndExcluding": "10.0.26100.7623"
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*",
              "vulnerable": true,
              "matchCriteriaId": "33E138A3-968B-4109-AC13-D488685F0AF2",
              "versionEndExcluding": "10.0.26200.7623"
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*",
              "vulnerable": true,
              "matchCriteriaId": "CC1FE5A1-3E6E-4606-899B-BF7BF3D3DD8D",
              "versionEndExcluding": "10.0.26200.7623"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "secure@microsoft.com"
}