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CVE-2024-27938

Estado: AnalizadaMedia (5.3)—

Postal is an open source SMTP server. Postal versions less than 3.0.0 are vulnerable to SMTP Smuggling attacks which may allow incoming e-mails to be spoofed. This, in conjunction with a cooperative outgoing SMTP service, would allow for an incoming e-mail to be received by Postal addressed from a server that a user has 'authorised' to send mail on their behalf but were not the genuine author of the e-mail. Postal is not affected for sending outgoing e-mails as email is re-encoded with `<CR><LF>` line endings when transmitted over SMTP.

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This issue has been addressed and users should upgrade to Postal v3.0.0 or higher. Once upgraded, Postal will only accept End of DATA sequences which are explicitly `<CR><LF>.<CR><LF>`. If a non-compliant sequence is detected it will be logged to the SMTP server log. There are no workarounds for this issue.

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)

Postalserver — Postal

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2024-27938",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-27938",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-08-27T19:45:59.549699Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      },
      {
        "type": "Primary",
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          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
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      "affectedData": [
        {
          "vendor": "postalserver",
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          "versions": [
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              "status": "affected",
              "version": "< 3.0.0"
            }
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          "vendor": "postalserver",
          "product": "postal",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "3.0.0",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        }
      ]
    }
  ],
  "published": "2024-03-11T22:15:55.490",
  "references": [
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      "url": "https://github.com/postalserver/postal/commit/0140dc4",
      "tags": [
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    {
      "url": "https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide",
      "tags": [
        "Technical Description"
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      "tags": [
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-116"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-116"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Postal is an open source SMTP server. Postal versions less than 3.0.0 are vulnerable to SMTP Smuggling attacks which may allow incoming e-mails to be spoofed. This, in conjunction with a cooperative outgoing SMTP service, would allow for an incoming e-mail to be received by Postal addressed from a server that a user has 'authorised' to send mail on their behalf but were not the genuine author of the e-mail. Postal is not affected for sending outgoing e-mails as email is re-encoded with `<CR><LF>` line endings when transmitted over SMTP. This issue has been addressed and users should upgrade to Postal v3.0.0 or higher. Once upgraded, Postal will only accept End of DATA sequences which are explicitly `<CR><LF>.<CR><LF>`. If a non-compliant sequence is detected it will be logged to the SMTP server log. There are no workarounds for this issue."
    },
    {
      "lang": "es",
      "value": "Postal es un servidor SMTP de código abierto. Las versiones postales inferiores a 3.0.0 son vulnerables a ataques de contrabando SMTP que pueden permitir que los correos electrónicos entrantes sean falsificados. Esto, junto con un servicio SMTP saliente cooperativo, permitiría recibir un correo electrónico entrante por correo postal con dirección desde un servidor que un usuario ha \"autorizado\" a enviar correo en su nombre pero que no es el verdadero autor del correo electrónico. -correo. Postal no se ve afectado para el envío de correos electrónicos salientes, ya que el correo electrónico se vuelve a codificar con finales de línea `` cuando se transmite a través de SMTP. Este problema se solucionó y los usuarios deben actualizar a Postal v3.0.0 o superior. Una vez actualizado, Postal solo aceptará secuencias de fin de DATOS que sean explícitamente `.`. Si se detecta una secuencia no compatible, se registrará en el registro del servidor SMTP. No existen soluciones alternativas para este problema."
    }
  ],
  "lastModified": "2026-06-17T07:20:38.157",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:postalserver:postal:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C06A3275-3BD9-4478-9D50-BB5739736A2F",
              "versionEndExcluding": "3.0.0"
            }
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          "operator": "OR"
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  "sourceIdentifier": "security-advisories@github.com"
}