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CVE-2024-27305

Estado: AnalizadaMedia (5.3)—

aiosmtpd is a reimplementation of the Python stdlib smtpd.py based on asyncio. aiosmtpd is vulnerable to inbound SMTP smuggling. SMTP smuggling is a novel vulnerability based on not so novel interpretation differences of the SMTP protocol. By exploiting SMTP smuggling, an attacker may send smuggle/spoof e-mails with fake sender addresses, allowing advanced phishing attacks. This issue is also existed in other SMTP software like Postfix. With the right SMTP server constellation, an attacker can send spoofed e-mails to inbound/receiving aiosmtpd instances. This issue has been addressed in version 1.4.5. Users are advised to upgrade. There are no known workarounds for this vulnerability.

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)

Aio-libs — Aiosmtpd

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2024-27305",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-27305",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-07-19T16:13:38.167510Z"
        }
      }
    ],
    "cvssMetricV31": [
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        "type": "Secondary",
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          "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",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "version": "3.1",
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          "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
      }
    ]
  },
  "affected": [
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      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "aio-libs",
          "product": "aiosmtpd",
          "versions": [
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              "status": "affected",
              "version": "< 1.4.5"
            }
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          "versions": [
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              "version": "0",
              "lessThan": "1.4.5",
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          ],
          "defaultStatus": "unknown"
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  ],
  "published": "2024-03-12T21:15:58.630",
  "references": [
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      "url": "https://github.com/aio-libs/aiosmtpd/commit/24b6c79c8921cf1800e27ca144f4f37023982bbb",
      "tags": [
        "Patch"
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    {
      "url": "https://github.com/aio-libs/aiosmtpd/security/advisories/GHSA-pr2m-px7j-xg65",
      "tags": [
        "Vendor Advisory"
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      "source": "security-advisories@github.com"
    },
    {
      "url": "https://www.postfix.org/smtp-smuggling.html",
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      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/aio-libs/aiosmtpd/commit/24b6c79c8921cf1800e27ca144f4f37023982bbb",
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    {
      "url": "https://www.postfix.org/smtp-smuggling.html",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-345"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-345"
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    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "aiosmtpd is a reimplementation of the Python stdlib smtpd.py based on asyncio. aiosmtpd is vulnerable to inbound SMTP smuggling. SMTP smuggling is a novel vulnerability based on not so novel interpretation differences of the SMTP protocol. By exploiting SMTP smuggling, an attacker may send smuggle/spoof e-mails with fake sender addresses, allowing advanced phishing attacks. This issue is also existed in other SMTP software like Postfix. With the right SMTP server constellation, an attacker can send spoofed e-mails to inbound/receiving aiosmtpd instances. This issue has been addressed in version 1.4.5. Users are advised to upgrade. There are no known workarounds for this vulnerability."
    },
    {
      "lang": "es",
      "value": "aiosmtpd es una reimplementación de Python stdlib smtpd.py basada en asyncio. aiosmtpd es vulnerable al contrabando SMTP entrante. El contrabando SMTP es una vulnerabilidad novedosa basada en diferencias de interpretación no tan novedosas del protocolo SMTP. Al explotar el contrabando SMTP, un atacante puede enviar correos electrónicos de contrabando/falsificación con direcciones de remitente falsas, lo que permite ataques de phishing avanzados. Este problema también existe en otro software SMTP como Postfix. Con la constelación de servidores SMTP adecuada, un atacante puede enviar correos electrónicos falsificados a instancias entrantes/receptoras de aiosmtpd. Este problema se solucionó en la versión 1.4.5. Se recomienda a los usuarios que actualicen. No se conocen workarounds para esta vulnerabilidad."
    }
  ],
  "lastModified": "2026-06-17T07:19:36.810",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:aio-libs:aiosmtpd:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "1.4.5"
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          "operator": "OR"
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  "sourceIdentifier": "security-advisories@github.com"
}