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CVE-2020-13671

Estado: AnalizadaAlta (8.8)⚠ Explotación activa💥 PoC

Drupal core no sanea apropiadamente determinados nombres de archivo en los archivos cargados, lo que puede conllevar a unos archivos ser interpretados como la extensión incorrecta y servir como el tipo MIME incorrecto o ser ejecutados como PHP para determinadas configuraciones de alojamiento. Este problema afecta: Drupal Drupal Core versiones 9.0 anteriores a 9.0.8, versiones 8.9 anteriores a 8.9.9, versiones 8.8 anteriores a 8.8.11 y versiones 7 anteriores a 7.74

CVSS

Probabilidad de explotación (EPSS)

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

💥 Exploits públicos

Hay código de explotación o plantillas de detección públicos. No es lo mismo que explotación activa confirmada (KEV), pero aumenta el riesgo: parchee con prioridad.

⚠️ Las pruebas de concepto de GitHub no están verificadas: algunas son falsas o contienen malware. No las ejecute nunca fuera de un laboratorio aislado.

🎯 Técnicas ATT&CK

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

Explotación corregida por reglas (vector CVSS): era T1190

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

Disable or Remove Feature or ProgramVulnerability ScanningUser Account ManagementThreat Intelligence ProgramRestrict File and Directory PermissionsPrivileged Account Management

Tecnologías afectadas (2)

Drupal — DrupalFedoraproject — Fedora

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2020-13671",
  "cveTags": [],
  "metrics": {
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      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2020-13671",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "active"
            },
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              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-02-07T12:38:31.133573Z"
        }
      }
    ],
    "cvssMetricV2": [
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        "cvssData": {
          "version": "2.0",
          "baseScore": 6.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
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        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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    "cvssMetricV31": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
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          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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  "affected": [
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      "affectedData": [
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          "product": "Drupal Core",
          "versions": [
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              "status": "affected",
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            },
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              "version": "7 versions prior to 7.74"
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  ],
  "published": "2020-11-20T16:15:15.433",
  "references": [
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5KSFM672XW3X6BR7TVKRD63SLZGKK437/",
      "tags": [
        "Mailing List",
        "Release Notes"
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      "source": "mlhess@drupal.org"
    },
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      "tags": [
        "Mailing List",
        "Release Notes"
      ],
      "source": "mlhess@drupal.org"
    },
    {
      "url": "https://www.drupal.org/sa-core-2020-012",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "mlhess@drupal.org"
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5KSFM672XW3X6BR7TVKRD63SLZGKK437/",
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      "tags": [
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      ],
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    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-13671",
      "tags": [
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      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-434"
        }
      ]
    },
    {
      "type": "Secondary",
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      "description": [
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      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Drupal core does not properly sanitize certain filenames on uploaded files, which can lead to files being interpreted as the incorrect extension and served as the wrong MIME type or executed as PHP for certain hosting configurations. This issue affects: Drupal Drupal Core 9.0 versions prior to 9.0.8, 8.9 versions prior to 8.9.9, 8.8 versions prior to 8.8.11, and 7 versions prior to 7.74."
    },
    {
      "lang": "es",
      "value": "Drupal core no sanea apropiadamente determinados nombres de archivo en los archivos cargados, lo que puede conllevar a unos archivos ser interpretados como la extensión incorrecta y servir como el tipo MIME incorrecto o ser ejecutados como PHP para determinadas configuraciones de alojamiento. Este problema afecta: Drupal Drupal Core versiones 9.0 anteriores a 9.0.8, versiones 8.9 anteriores a 8.9.9, versiones 8.8 anteriores a 8.8.11 y  versiones 7 anteriores a 7.74"
    }
  ],
  "lastModified": "2026-06-17T02:53:32.867",
  "cisaActionDue": "2022-07-18",
  "cisaExploitAdd": "2022-01-18",
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  "cisaRequiredAction": "Apply updates per vendor instructions.",
  "cisaVulnerabilityName": "Drupal core Un-restricted Upload of File"
}