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CVE-2021-21265

Estado: ModificadaAlta (7.5)—

October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. In October before version 1.1.2, when running on poorly configured servers (i.e. the server routes any request, regardless of the HOST header to an October CMS instance) the potential exists for Host Header Poisoning attacks to succeed. This has been addressed in version 1.1.2 by adding a feature to allow a set of trusted hosts to be specified in the application. As a workaround one may set the configuration setting cms.linkPolicy to force.

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)

Octobercms — October

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-21265",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 6.8,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 4,
        "exploitabilityScore": 2.2
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "octobercms",
          "product": "october",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.1.2"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-03-10T22:15:12.057",
  "references": [
    {
      "url": "https://github.com/octobercms/library/commit/f29865ae3db7a03be7c49294cd93980ec457f10d",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/octobercms/library/commit/f86fcbcd066d6f8b939e8fe897409d152b11c3c6",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/octobercms/october/commit/555ab61f2313f45d7d5d138656420ead536c5d30",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/octobercms/october/commit/f638d3f78cfe91d7f6658820f9d5e424306a3db0",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/octobercms/october/security/advisories/GHSA-xhfx-hgmf-v6vp",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://packagist.org/packages/october/backend",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/octobercms/library/commit/f86fcbcd066d6f8b939e8fe897409d152b11c3c6",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/octobercms/october/commit/f638d3f78cfe91d7f6658820f9d5e424306a3db0",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/octobercms/october/security/advisories/GHSA-xhfx-hgmf-v6vp",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-644"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. In October before version 1.1.2, when running on poorly configured servers (i.e. the server routes any request, regardless of the HOST header to an October CMS instance) the potential exists for Host Header Poisoning attacks to succeed. This has been addressed in version 1.1.2 by adding a feature to allow a set of trusted hosts to be specified in the application. As a workaround one may set the configuration setting cms.linkPolicy to force."
    },
    {
      "lang": "es",
      "value": "October es una plataforma CMS gratuita, de código abierto y autoinvitada basada en Laravel PHP Framework.&#xa0;En October versiones anteriores a 1.1.2, cuando se ejecuta en servidores mal configurados (es decir, el servidor enruta cualquier petición, independientemente del encabezado HOST hacia una instancia CMS de october), se presenta la posibilidad de que los ataques de Envenenamiento del Encabezado de host tengan éxito.&#xa0;Esto ha sido solucionado en la versión 1.1.2, al agregar una función para permitir que se especifique un conjunto de hosts confiables en la aplicación.&#xa0;Como solución alternativa, puede establecerse el ajuste de configuración cms.linkPolicy para forzar"
    }
  ],
  "lastModified": "2026-06-17T03:35:09.290",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:octobercms:october:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E34205D2-FCF8-4F33-8835-3CEA0E253936",
              "versionEndExcluding": "1.1.2"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}