« Volver al listado

CVE-2025-27458

Estado: AnalizadaAlta (7.5)—

The VNC authentication mechanism bases on a challenge-response system where both server and client use the same password for encryption. The challenge is sent from the server to the client, is encrypted by the client and sent back. The server does the same encryption locally and if the responses match it is prooven that the client knows the correct password. Since all VNC communication is unencrypted, an attacker can obtain the challenge and response and try to derive the password from this information.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

VNC expuesto en red sin autenticación fuerte (CWE-327: criptografía débil). Atacante obtiene challenge-response y deriva contraseña.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Application Isolation and SandboxingExploit ProtectionUpdate SoftwareApplication Developer GuidanceVulnerability ScanningThreat Intelligence Program

Tecnologías afectadas (1)

Endress — Meac300-fnade4 Firmware

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2025-27458",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-27458",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-07-03T12:59:45.758774Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "psirt@sick.de",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "psirt@sick.de",
      "affectedData": [
        {
          "vendor": "Endress+Hauser",
          "product": "Endress+Hauser MEAC300-FNADE4",
          "versions": [
            {
              "status": "affected",
              "version": "vers:all/*",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-07-03T12:15:23.917",
  "references": [
    {
      "url": "https://sick.com/psirt",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@sick.de"
    },
    {
      "url": "https://sick.com/psirt",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@sick.de"
    },
    {
      "url": "https://sick.com/psirt",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@sick.de"
    },
    {
      "url": "https://sick.com/psirt",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@sick.de"
    },
    {
      "url": "https://www.cisa.gov/resources-tools/resources/ics-recommended-practices",
      "tags": [
        "US Government Resource"
      ],
      "source": "psirt@sick.de"
    },
    {
      "url": "https://www.endress.com",
      "tags": [
        "Product"
      ],
      "source": "psirt@sick.de"
    },
    {
      "url": "https://www.first.org/cvss/calculator/3.1",
      "tags": [
        "Not Applicable"
      ],
      "source": "psirt@sick.de"
    },
    {
      "url": "https://www.sick.com/.well-known/csaf/white/2025/sca-2025-0008.json",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@sick.de"
    },
    {
      "url": "https://www.sick.com/.well-known/csaf/white/2025/sca-2025-0008.pdf",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@sick.de"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "psirt@sick.de",
      "description": [
        {
          "lang": "en",
          "value": "CWE-327"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The VNC authentication mechanism bases on a challenge-response system where both server and client use the same password for encryption. The challenge is sent from the server to the client, is encrypted by the client and sent back. The server does the same encryption locally and if the responses match it is prooven that the client knows the correct password. Since all VNC communication is unencrypted, an attacker can obtain the challenge and response and try to derive the password from this information."
    },
    {
      "lang": "es",
      "value": "El mecanismo de autenticación de VNC se basa en un sistema de desafío-respuesta donde tanto el servidor como el cliente usan la misma contraseña para el cifrado. El desafío se envía del servidor al cliente, este lo cifra y lo devuelve. El servidor realiza el mismo cifrado localmente y, si las respuestas coinciden, se comprueba que el cliente conoce la contraseña correcta. Dado que toda la comunicación de VNC no está cifrada, un atacante puede obtener el desafío y la respuesta e intentar obtener la contraseña a partir de esta información."
    }
  ],
  "lastModified": "2026-06-17T09:03:37.743",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:endress:meac300-fnade4_firmware:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D6974A7C-0F9F-4B43-8272-AFE330F0D034"
            }
          ],
          "operator": "OR"
        },
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:endress:meac300-fnade4:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "EDCFDEA0-D85E-464F-98FD-42775C42812F"
            }
          ],
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "sourceIdentifier": "psirt@sick.de"
}