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CVE-2017-17439

Estado: ModificadaAlta (7.5)—

In Heimdal through 7.4, remote unauthenticated attackers are able to crash the KDC by sending a crafted UDP packet containing empty data fields for client name or realm. The parser would unconditionally dereference NULL pointers in that case, leading to a segmentation fault. This is related to the _kdc_as_rep function in kdc/kerberos5.c and the der_length_visible_string function in lib/asn1/der_length.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).

Tecnologías afectadas (2)

Debian — Debian LinuxHeimdal Project — Heimdal

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2017-17439",
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
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          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
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      "value": "In Heimdal through 7.4, remote unauthenticated attackers are able to crash the KDC by sending a crafted UDP packet containing empty data fields for client name or realm. The parser would unconditionally dereference NULL pointers in that case, leading to a segmentation fault. This is related to the _kdc_as_rep function in kdc/kerberos5.c and the der_length_visible_string function in lib/asn1/der_length.c."
    },
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      "lang": "es",
      "value": "En Heimdal hasta la versión 7.4 atacantes remotos no autenticados pueden provocar el cierre inesperado del KDC enviando un paquete UDP manipulado que contenga campos de datos vacíos para el nombre del cliente o para el realm. En ese caso, el analizador sintáctico desreferenciará punteros NULL incondicionalmente, lo que dará lugar a un fallo de segmentación. Esto está relacionado con la función _kdc_as_rep en kdc/kerberos5.c y la función der_length_visible_string function en lib/asn1/der_length.c."
    }
  ],
  "lastModified": "2026-06-17T01:10:48.137",
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