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CVE-2021-21359

Estado: ModificadaAlta (7.5)—

TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 9.5.25, 10.4.14, 11.1.1 requesting invalid or non-existing resources via HTTP triggers the page error handler which again could retrieve content to be shown as error message from another page. This leads to a scenario in which the application is calling itself recursively - amplifying the impact of the initial attack until the limits of the web server are exceeded. This is fixed in versions 9.5.25, 10.4.14, 11.1.1.

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).

Tecnologías afectadas (1)

Typo3 — Typo3

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2021-21359",
  "cveTags": [],
  "metrics": {
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        "source": "nvd@nist.gov",
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
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        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
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          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
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          "confidentialityImpact": "NONE"
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  "published": "2021-03-23T02:15:12.893",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-405"
        },
        {
          "lang": "en",
          "value": "CWE-674"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 9.5.25, 10.4.14, 11.1.1 requesting invalid or non-existing resources via HTTP triggers the page error handler which again could retrieve content to be shown as error message from another page. This leads to a scenario in which the application is calling itself recursively - amplifying the impact of the initial attack until the limits of the web server are exceeded. This is fixed in versions 9.5.25, 10.4.14, 11.1.1."
    },
    {
      "lang": "es",
      "value": "TYPO3 es un sistema de gestión de contenidos web de código abierto basado en PHP. En TYPO3 versiones anteriores a la 9.5.25, 10.4.14, 11.1.1 la solicitud de recursos inválidos o inexistentes a través de HTTP desencadena el manejador de errores de la página que de nuevo podría recuperar el contenido que se muestra como mensaje de error de otra página. Esto lleva a un escenario en el que la aplicación se llama a sí misma de forma recursiva, amplificando el impacto del ataque inicial hasta que se superan los límites del servidor web. Esto se ha corregido en las versiones 9.5.25, 10.4.14 y 11.1.1"
    }
  ],
  "lastModified": "2026-06-17T03:35:23.133",
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