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CVE-2023-42117

Estado: ModificadaCrítica (9.8)—

Exim Improper Neutralization of Special Elements Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the smtp service, which listens on TCP port 25 by default. The issue results from the lack of proper validation of user-supplied data, which can result in a memory corruption condition. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-17554.

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)

Exim — Exim

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2023-42117",
  "cveTags": [],
  "metrics": {
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          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-05-03T16:58:53.804935Z"
        }
      }
    ],
    "cvssMetricV30": [
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        "source": "zdi-disclosures@trendmicro.com",
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          "baseScore": 8.1,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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  "published": "2024-05-03T03:15:50.463",
  "references": [
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      "url": "https://www.zerodayinitiative.com/advisories/ZDI-23-1471/",
      "tags": [
        "Third Party Advisory"
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      "source": "zdi-disclosures@trendmicro.com"
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      "url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00029.html",
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  "vulnStatus": "Modified",
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      "type": "Secondary",
      "source": "zdi-disclosures@trendmicro.com",
      "description": [
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          "lang": "en",
          "value": "CWE-138"
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Exim Improper Neutralization of Special Elements Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the smtp service, which listens on TCP port 25 by default. The issue results from the lack of proper validation of user-supplied data, which can result in a memory corruption condition. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-17554."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de ejecución remota de código de neutralización inadecuada de elementos especiales de Exim. Esta vulnerabilidad permite a atacantes remotos ejecutar código arbitrario en las instalaciones afectadas de Exim. No se requiere autenticación para aprovechar esta vulnerabilidad. La falla específica existe dentro del servicio smtp, que escucha en el puerto TCP 25 de forma predeterminada. El problema se debe a la falta de validación adecuada de los datos proporcionados por el usuario, lo que puede provocar una condición de corrupción de la memoria. Un atacante puede aprovechar esta vulnerabilidad para ejecutar código en el contexto del proceso actual. Era ZDI-CAN-17554."
    }
  ],
  "lastModified": "2026-06-17T06:23:29.867",
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