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CVE-2020-5247

Estado: ModificadaAlta (7.5)—

In Puma (RubyGem) before 4.3.2 and before 3.12.3, if an application using Puma allows untrusted input in a response header, an attacker can use newline characters (i.e. `CR`, `LF` or`/r`, `/n`) to end the header and inject malicious content, such as additional headers or an entirely new response body. This vulnerability is known as HTTP Response Splitting. While not an attack in itself, response splitting is a vector for several other attacks, such as cross-site scripting (XSS). This is related to CVE-2019-16254, which fixed this vulnerability for the WEBrick Ruby web server. This has been fixed in versions 4.3.2 and 3.12.3 by checking all headers for line endings and rejecting headers with those characters.

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 (4)

Debian — Debian LinuxFedoraproject — FedoraPuma — PumaRuby-lang — Ruby

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2020-5247",
  "cveTags": [],
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          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
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      "lang": "en",
      "value": "In Puma (RubyGem) before 4.3.2 and before 3.12.3, if an application using Puma allows untrusted input in a response header, an attacker can use newline characters (i.e. `CR`, `LF` or`/r`, `/n`) to end the header and inject malicious content, such as additional headers or an entirely new response body. This vulnerability is known as HTTP Response Splitting. While not an attack in itself, response splitting is a vector for several other attacks, such as cross-site scripting (XSS). This is related to CVE-2019-16254, which fixed this vulnerability for the WEBrick Ruby web server. This has been fixed in versions 4.3.2 and 3.12.3 by checking all headers for line endings and rejecting headers with those characters."
    },
    {
      "lang": "es",
      "value": "En Puma (RubyGem) anterior a la versión  4.3.2 y anterior a la versión 3.12.3, si una aplicación que usa Puma permite la entrada no segura en un encabezado de respuesta, un atacante puede usar caracteres de nueva línea (es decir, `CR`,` LF` o` / r`, ` / n`) para finalizar el encabezado e inyectar contenido malicioso, como encabezados adicionales o un cuerpo de respuesta completamente nuevo. Esta vulnerabilidad se conoce como división de respuesta HTTP. Si bien no es un ataque en sí mismo, la división de la respuesta es un vector para varios otros ataques, como las secuencias de cross-site scripting (XSS). Esto está relacionado con CVE-2019-16254, que corrigió esta vulnerabilidad para el servidor web WEBrick Ruby. Esto se ha solucionado en las versiones 4.3.2 y 3.12.3 verificando todos los encabezados para ver los finales de línea y rechazando los encabezados con esos caracteres."
    }
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  "lastModified": "2026-06-17T03:21:07.497",
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