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CVE-2026-48684

Estado: AnalizadaMedia (6.5)—

FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read in the NetFlow v9 options template parser. In process_netflow_v9_options_template() (src/netflow_plugin/netflow_v9_collector.cpp), the scope parsing loop (lines 224-229) iterates until scopes_offset reaches the attacker-controlled option_scope_length value, reading netflow9_template_flowset_record_t structures at each step. No bounds check validates that (zone_address + scopes_offset + sizeof(record)) stays within the flowset. The same issue affects the options field loop (lines 241-257) with option_length.

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Furthermore, option_scope_length is not validated to be a multiple of sizeof(netflow9_template_flowset_record_t), potentially causing misaligned reads. An attacker can trigger reads past the end of the UDP packet buffer.

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)

Pavel-odintsov — Fastnetmon

CWE

Referencias

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  "id": "CVE-2026-48684",
  "cveTags": [],
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          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
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            {
              "automatable": "yes"
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            {
              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-05-26T20:58:06.555735Z"
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
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  "published": "2026-05-26T16:16:26.440",
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      "value": "FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read in the NetFlow v9 options template parser. In process_netflow_v9_options_template() (src/netflow_plugin/netflow_v9_collector.cpp), the scope parsing loop (lines 224-229) iterates until scopes_offset reaches the attacker-controlled option_scope_length value, reading netflow9_template_flowset_record_t structures at each step. No bounds check validates that (zone_address + scopes_offset + sizeof(record)) stays within the flowset. The same issue affects the options field loop (lines 241-257) with option_length. Furthermore, option_scope_length is not validated to be a multiple of sizeof(netflow9_template_flowset_record_t), potentially causing misaligned reads. An attacker can trigger reads past the end of the UDP packet buffer."
    },
    {
      "lang": "es",
      "value": "FastNetMon Community Edition hasta la versión 1.2.9 contiene una lectura fuera de límites en el analizador de plantillas de opciones de NetFlow v9. En process_netflow_v9_options_template() (src/netflow_plugin/netflow_v9_collector.cpp), el bucle de análisis de alcance (líneas 224-229) itera hasta que scopes_offset alcanza el valor option_scope_length controlado por el atacante, leyendo estructuras netflow9_template_flowset_record_t en cada paso. Ninguna comprobación de límites valida que (zone_address + scopes_offset + sizeof(record)) permanezca dentro del flowset. El mismo problema afecta al bucle del campo de opciones (líneas 241-257) con option_length. Además, option_scope_length no se valida para ser un múltiplo de sizeof(netflow9_template_flowset_record_t), lo que podría causar lecturas desalineadas. Un atacante puede desencadenar lecturas más allá del final del búfer del paquete UDP."
    }
  ],
  "lastModified": "2026-07-24T11:10:00.170",
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