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CVE-2020-8794

Estado: ModificadaCrítica (9.8)—

OpenSMTPD before 6.6.4 allows remote code execution because of an out-of-bounds read in mta_io in mta_session.c for multi-line replies. Although this vulnerability affects the client side of OpenSMTPD, it is possible to attack a server because the server code launches the client code during bounce handling.

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)

Canonical — Ubuntu LinuxDebian — Debian LinuxFedoraproject — FedoraOpensmtpd — Opensmtpd

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2020-8794",
  "cveTags": [],
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
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        "acInsufInfo": false,
        "impactScore": 10,
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        "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",
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  "published": "2020-02-25T17:15:13.197",
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      "description": [
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          "lang": "en",
          "value": "CWE-125"
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      "lang": "en",
      "value": "OpenSMTPD before 6.6.4 allows remote code execution because of an out-of-bounds read in mta_io in mta_session.c for multi-line replies. Although this vulnerability affects the client side of OpenSMTPD, it is possible to attack a server because the server code launches the client code during bounce handling."
    },
    {
      "lang": "es",
      "value": "OpenSMTPD versiones anteriores a 6.6.4, permite una ejecución de código remota debido a una lectura fuera de límites en la función mta_io en el archivo mta_session.c para respuestas multilínea. Aunque esta vulnerabilidad afecta al lado del cliente de OpenSMTPD, es posible atacar a un servidor porque el código del servidor inicia el código del cliente durante el manejo de saltos."
    }
  ],
  "lastModified": "2026-06-17T03:26:57.320",
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