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CVE-2017-17671

Estado: ModificadaCrítica (9.8)—

vBulletin through 5.3.x on Windows allows remote PHP code execution because a require_once call is reachable with an unauthenticated request that can include directory traversal sequences to specify an arbitrary pathname, and because ../ traversal is blocked but ..\ traversal is not blocked. For example, an attacker can make an invalid HTTP request containing PHP code, and then make an index.php?routestring= request with enough instances of ".." to reach an Apache HTTP Server log file.

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)

Vbulletin — Vbulletin

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2017-17671",
  "cveTags": [],
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 7.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
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        "impactScore": 6.4,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
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          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
        "exploitabilityScore": 3.9
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  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
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  "published": "2017-12-14T00:29:00.217",
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      "url": "https://blogs.securiteam.com/index.php/archives/3569",
      "tags": [
        "Exploit",
        "Third Party Advisory"
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      "source": "cve@mitre.org"
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      "description": [
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          "lang": "en",
          "value": "CWE-22"
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      "lang": "en",
      "value": "vBulletin through 5.3.x on Windows allows remote PHP code execution because a require_once call is reachable with an unauthenticated request that can include directory traversal sequences to specify an arbitrary pathname, and because ../ traversal is blocked but ..\\ traversal is not blocked. For example, an attacker can make an invalid HTTP request containing PHP code, and then make an index.php?routestring= request with enough instances of \"..\" to reach an Apache HTTP Server log file."
    },
    {
      "lang": "es",
      "value": "vBulletin hasta las versiones 5.3.x en Windows permite la ejecución remota de código PHP debido a que una llamada require_once es alcanzable con una petición que puede incluir secuencias de salto de directorio para especificar un nombre de ruta arbitrario y porque el salto ../ está bloqueado, pero el salto ..\\ no lo está. Por ejemplo, un atacante puede realizar una petición HTTP inválida que contiene código PHP y, a continuación, realizar una petición index.php?routestring= con las suficientes instancias de \"..\" para alcanzar un archivo de registro de Apache HTTP Server."
    }
  ],
  "lastModified": "2026-06-17T01:11:28.360",
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