CVE-2020-14954

Estado: ModificadaMedia (5.9)—
Mutt before 1.14.4 and NeoMutt before 2020-06-19 have a STARTTLS buffering issue that affects IMAP, SMTP, and POP3. When a server sends a "begin TLS" response, the client reads additional data (e.g., from a man-in-the-middle attacker) and evaluates it in a TLS context, aka "response injection."
CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Puntuación base: 5.9
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 2.31%
Percentil entre todas las CVEs puntuadas: 83
Fecha de la puntuación: 6/10/2026
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 (6)

Canonical — Ubuntu Linux Debian — Debian Linux Fedoraproject — Fedora Mutt — Mutt Neomutt — Neomutt Opensuse — Leap
CWE

CWE-74
Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2020-14954",
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          "authentication": "NONE",
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-74"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mutt before 1.14.4 and NeoMutt before 2020-06-19 have a STARTTLS buffering issue that affects IMAP, SMTP, and POP3. When a server sends a \"begin TLS\" response, the client reads additional data (e.g., from a man-in-the-middle attacker) and evaluates it in a TLS context, aka \"response injection.\""
    },
    {
      "lang": "es",
      "value": "Mutt versiones anteriores a 1.14.4 y NeoMutt antes del 19-06-2020, presentan un problema de almacenamiento de STARTTLS que afecta a IMAP, SMTP y POP3. Cuando un servidor envía una respuesta \"begin TLS\", el cliente lee datos adicionales (por ejemplo, a partir de un atacante man-in-the-middle) y los evalúa en un contexto TLS, también se conoce como \"response injection\""
    }
  ],
  "lastModified": "2026-06-17T02:55:49.630",
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