{
  "id": "CVE-2021-41267",
  "sourceIdentifier": "security-advisories@github.com",
  "published": "2021-11-24T19:15:07.737",
  "lastModified": "2021-11-30T18:52:27.077",
  "vulnStatus": "Analyzed",
  "descriptions": [
    {
      "lang": "en",
      "value": "Symfony/Http-Kernel is the HTTP kernel component for Symfony, a PHP framework for web and console applications and a set of reusable PHP components. Headers that are not part of the \"trusted_headers\" allowed list are ignored and protect users from \"Cache poisoning\" attacks. In Symfony 5.2, maintainers added support for the `X-Forwarded-Prefix` headers, but this header was accessible in SubRequest, even if it was not part of the \"trusted_headers\" allowed list. An attacker could leverage this opportunity to forge requests containing a `X-Forwarded-Prefix` header, leading to a web cache poisoning issue. Versions 5.3.12 and later have a patch to ensure that the `X-Forwarded-Prefix` header is not forwarded to subrequests when it is not trusted."
    },
    {
      "lang": "es",
      "value": "Symfony/Http-Kernel es el componente del n\u00facleo HTTP de Symfony, un framework PHP para aplicaciones web y de consola y un conjunto de componentes PHP reusables. Los encabezados que no forman parte de la lista permitida \"trusted_headers\" son ignoradas y protegen a los usuarios de ataques de \"Cache poisoning\". En Symfony versi\u00f3n 5.2, los mantenedores a\u00f1adieron soporte para los encabezados \"X-Forwarded-Prefix\", pero este encabezado era accesible en SubRequest, incluso si no era parte de la lista permitida \"trusted_headers\". Un atacante podr\u00eda aprovechar esta oportunidad para falsificar peticiones que contengan un encabezado \"X-Forwarded-Prefix\", conllevando aun problema de envenenamiento de la cach\u00e9 web. Las versiones 5.3.12 y posteriores presentan un parche para asegurar que el encabezado \"X-Forwarded-Prefix\" no es reenviado a las subpeticiones cuando no es confiable"
    }
  ],
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          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "REQUIRED",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6
      }
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          "accessVector": "NETWORK",
          "accessComplexity": "MEDIUM",
          "authentication": "NONE",
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "availabilityImpact": "NONE",
          "baseScore": 4.3
        },
        "baseSeverity": "MEDIUM",
        "exploitabilityScore": 8.6,
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        "acInsufInfo": false,
        "obtainAllPrivilege": false,
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      "source": "security-advisories@github.com",
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      "description": [
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          "value": "CWE-444"
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      "url": "https://github.com/symfony/symfony/commit/95dcf51682029e89450aee86267e3d553aa7c487",
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