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CVE-2017-9798

Estado: ModificadaAlta (7.5)—💥 Exploit

Apache httpd allows remote attackers to read secret data from process memory if the Limit directive can be set in a user's .htaccess file, or if httpd.conf has certain misconfigurations, aka Optionsbleed. This affects the Apache HTTP Server through 2.2.34 and 2.4.x through 2.4.27. The attacker sends an unauthenticated OPTIONS HTTP request when attempting to read secret data. This is a use-after-free issue and thus secret data is not always sent, and the specific data depends on many factors including configuration. Exploitation with .htaccess can be blocked with a patch to the ap_limit_section function in server/core.c.

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)

Apache — Http ServerDebian — Debian Linux

CWE

Referencias

JSON original (NVD)

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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Apache httpd allows remote attackers to read secret data from process memory if the Limit directive can be set in a user's .htaccess file, or if httpd.conf has certain misconfigurations, aka Optionsbleed. This affects the Apache HTTP Server through 2.2.34 and 2.4.x through 2.4.27. The attacker sends an unauthenticated OPTIONS HTTP request when attempting to read secret data. This is a use-after-free issue and thus secret data is not always sent, and the specific data depends on many factors including configuration. Exploitation with .htaccess can be blocked with a patch to the ap_limit_section function in server/core.c."
    },
    {
      "lang": "es",
      "value": "Apache httpd permite que atacantes remotos lean datos secretos de la memoria de proceso si la directiva Limit se puede establecer en un archivo .htaccess del usuario o si existen ciertos errores de configuración en httpd.conf. Esto también se conoce como Optionsbleed. Esta vulnerabilidad afecta a Apache HTTP Server hasta la versión 2.2.34 y a las versiones 2.4.x hasta la 2.4.27. El atacante envía una petición HTTP OPTIONS sin autenticar cuando intenta leer datos secretos. Este es un problema de uso de memoria previamente liberada y, por lo tanto, los datos secretos no siempre se envían y los datos específicos dependen de muchos factores, entre los que se encuentra la configuración. La explotación con .htaccess puede bloquearse con un parche en la función ap_limit_section en server/core.c."
    }
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  "lastModified": "2026-06-17T01:28:56.200",
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