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CVE-2021-29447

Estado: ModificadaMedia (6.5)—💥 Exploit

Wordpress es un CMS de código abierto. Un usuario con la capacidad de cargar archivos (como un Autor) puede explotar un problema de análisis de XML en Media Library conllevando a ataques de tipo XXE. Esto requiere que la instalación de WordPress utilice PHP versión 8. El acceso a archivos internos es posible en un ataque de tipo XXE con éxito. Esto ha sido parcheado en versión WordPress versión 5.7.1, junto con las versiones anteriores afectadas por medio de una versión menor. Se recomienda encarecidamente que mantenga habilitadas las actualizaciones automáticas

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).

💥 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.

Tecnologías afectadas (2)

Debian — Debian LinuxWordpress — Wordpress

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2021-29447",
  "cveTags": [],
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        "source": "nvd@nist.gov",
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          "vectorString": "AV:N/AC:L/Au:S/C:P/I:N/A:N",
          "authentication": "SINGLE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
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        "acInsufInfo": false,
        "impactScore": 2.9,
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        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
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  "published": "2021-04-15T21:15:17.723",
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      "url": "http://packetstormsecurity.com/files/163148/XML-External-Entity-Via-MP3-File-Upload-On-WordPress.html",
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  "descriptions": [
    {
      "lang": "en",
      "value": "Wordpress is an open source CMS. A user with the ability to upload files (like an Author) can exploit an XML parsing issue in the Media Library leading to XXE attacks. This requires WordPress installation to be using PHP 8. Access to internal files is possible in a successful XXE attack. This has been patched in WordPress version 5.7.1, along with the older affected versions via a minor release. We strongly recommend you keep auto-updates enabled."
    },
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      "lang": "es",
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    }
  ],
  "lastModified": "2026-06-17T03:47:39.597",
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}