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CVE-2018-11407

Status: ModifiedCritical (9.8)—

An issue was discovered in the Ldap component in Symfony 2.8.x before 2.8.37, 3.3.x before 3.3.17, 3.4.x before 3.4.7, and 4.0.x before 4.0.7. It allows remote attackers to bypass authentication by logging in with a "null" password and valid username, which triggers an unauthenticated bind. NOTE: this issue exists because of an incomplete fix for CVE-2016-2403.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Sensiolabs — Symfony

CWEs

References

Raw JSON (NVD)

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  "id": "CVE-2018-11407",
  "cveTags": [],
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          "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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        "acInsufInfo": false,
        "impactScore": 6.4,
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        "obtainAllPrivilege": false,
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  "published": "2018-06-13T16:29:01.047",
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      "url": "https://symfony.com/blog/cve-2018-11407-unauthorized-access-on-a-misconfigured-ldap-server-when-using-an-empty-password",
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          "value": "CWE-287"
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      "value": "An issue was discovered in the Ldap component in Symfony 2.8.x before 2.8.37, 3.3.x before 3.3.17, 3.4.x before 3.4.7, and 4.0.x before 4.0.7. It allows remote attackers to bypass authentication by logging in with a \"null\" password and valid username, which triggers an unauthenticated bind.  NOTE: this issue exists because of an incomplete fix for CVE-2016-2403."
    },
    {
      "lang": "es",
      "value": "Se ha descubierto un problema en el componente Ldap en Symfony en versiones 2.8.x anteriores a la 2.8.37, versiones 3.3.x anteriores a la 3.3.17, versiones 3.4.x anteriores a la 3.4.7, y versiones 4.0.x anteriores a la 4.0.7. Permite que atacantes remotos omitan la autenticación mediante el inicio de sesión con una contraseña \"null\" y un nombre de usuario válido, lo que desencadena un enlace no autenticado. NOTA: este problema existe debido a una solución incompleta para CVE-2016-2403."
    }
  ],
  "lastModified": "2026-06-17T01:35:52.347",
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