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CVE-2026-48697

Estado: AnalizadaAlta (7.4)—

FastNetMon Community Edition through 1.2.9 does not verify TLS certificates on outbound HTTPS connections. The execute_web_request_secure() function in src/fast_library.cpp creates a boost::asio::ssl::context with tls_client mode and calls set_default_verify_paths() to load CA certificates, but never calls set_verify_mode(boost::asio::ssl::verify_peer). Without this call, OpenSSL performs the TLS handshake without validating the server's certificate chain, making all HTTPS connections vulnerable to man-in-the-middle attacks.

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This function is used for telemetry reporting to community-stats.fastnetmon.com, which sends system information including CPU model, kernel version, traffic statistics, and software configuration. An attacker can intercept and modify this data or redirect it to a malicious server.

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.

CWE-295 sin validación de certificado TLS permite MITM en conexiones HTTPS. El atacante intercepta telemetría con datos sensibles (CPU, kernel, estadísticas de tráfico).

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

User TrainingNetwork SegmentationNetwork Intrusion PreventionLimit Access to Resource Over NetworkFilter Network TrafficEncrypt Sensitive Information

Tecnologías afectadas (1)

Pavel-odintsov — Fastnetmon

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-48697",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-48697",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-05-26T20:29:32.321553Z"
        }
      }
    ],
    "cvssMetricV31": [
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        "source": "nvd@nist.gov",
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          "version": "3.1",
          "baseScore": 7.4,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "exploitabilityScore": 2.2
      },
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        "type": "Secondary",
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          "scope": "UNCHANGED",
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          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
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  "affected": [
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  "published": "2026-05-26T17:16:53.920",
  "references": [
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      "url": "https://github.com/pavel-odintsov/fastnetmon",
      "tags": [
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      "source": "cve@mitre.org"
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      "url": "https://github.com/pavel-odintsov/fastnetmon/blob/master/src/fast_library.cpp",
      "tags": [
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      "source": "cve@mitre.org"
    },
    {
      "url": "https://lorikeetsecurity.com/blog/fastnetmon-cve-2026-48697-missing-tls-validation",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "FastNetMon Community Edition through 1.2.9 does not verify TLS certificates on outbound HTTPS connections. The execute_web_request_secure() function in src/fast_library.cpp creates a boost::asio::ssl::context with tls_client mode and calls set_default_verify_paths() to load CA certificates, but never calls set_verify_mode(boost::asio::ssl::verify_peer). Without this call, OpenSSL performs the TLS handshake without validating the server's certificate chain, making all HTTPS connections vulnerable to man-in-the-middle attacks. This function is used for telemetry reporting to community-stats.fastnetmon.com, which sends system information including CPU model, kernel version, traffic statistics, and software configuration. An attacker can intercept and modify this data or redirect it to a malicious server."
    },
    {
      "lang": "es",
      "value": "FastNetMon Community Edition hasta la 1.2.9 no verifica los certificados TLS en conexiones HTTPS salientes. La función execute_web_request_secure() en src/fast_library.cpp crea un boost::asio::ssl::context con modo tls_client y llama a set_default_verify_paths() para cargar certificados CA, pero nunca llama a set_verify_mode(boost::asio::ssl::verify_peer). Sin esta llamada, OpenSSL realiza el handshake TLS sin validar la cadena de certificados del servidor, haciendo que todas las conexiones HTTPS sean vulnerables a ataques de man-in-the-middle. Esta función se utiliza para informes de telemetría a community-stats.fastnetmon.com, que envía información del sistema incluyendo modelo de CPU, versión del kernel, estadísticas de tráfico y configuración de software. Un atacante puede interceptar y modificar estos datos o redirigirlos a un servidor malicioso."
    }
  ],
  "lastModified": "2026-07-24T11:10:00.170",
  "configurations": [
    {
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        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:pavel-odintsov:fastnetmon:*:*:*:*:community:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E712A01F-3AD7-4CC2-9A8B-F8C63756EBBF",
              "versionEndIncluding": "1.2.9"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}