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CVE-2026-48682

Estado: AplazadaMedia (5.9)—

FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read in the IPv4 packet parser. In src/simple_packet_parser_ng.cpp, after validating that the packet contains at least sizeof(ipv4_header_t) bytes (20 bytes), the code advances the local_pointer by '4 * ipv4_header->get_ihl()' (line 164) without validating that (a) IHL >= 5 (the minimum valid value per RFC 791), or (b) 4 * IHL bytes are actually available in the packet. The IHL field is 4 bits, allowing values 0-15, so the advance can be 0-60 bytes. An IHL value of 15 with only 20 bytes validated causes a 40-byte over-read.

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An IHL of 0-4 causes the pointer to not advance past the IP header, resulting in the TCP/UDP header being parsed from IP header data (type confusion). This vulnerability is reachable via any packet capture interface.

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)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Fastnetmon — Fastnetmon Community EditionAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-48682",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-48682",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-03T16:04:36.835083Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.9,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.2
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-06-02T20:16:38.993",
  "references": [
    {
      "url": "https://github.com/pavel-odintsov/fastnetmon",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://github.com/pavel-odintsov/fastnetmon/blob/master/src/simple_packet_parser_ng.cpp",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://lorikeetsecurity.com/blog/fastnetmon-cve-2026-48682-ipv4-parser-oob",
      "source": "cve@mitre.org"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read in the IPv4 packet parser. In src/simple_packet_parser_ng.cpp, after validating that the packet contains at least sizeof(ipv4_header_t) bytes (20 bytes), the code advances the local_pointer by '4 * ipv4_header->get_ihl()' (line 164) without validating that (a) IHL >= 5 (the minimum valid value per RFC 791), or (b) 4 * IHL bytes are actually available in the packet. The IHL field is 4 bits, allowing values 0-15, so the advance can be 0-60 bytes. An IHL value of 15 with only 20 bytes validated causes a 40-byte over-read. An IHL of 0-4 causes the pointer to not advance past the IP header, resulting in the TCP/UDP header being parsed from IP header data (type confusion). This vulnerability is reachable via any packet capture interface."
    },
    {
      "lang": "es",
      "value": "FastNetMon Community Edition hasta la versión 1.2.9 contiene una lectura fuera de límites en el analizador de paquetes IPv4. En src/simple_packet_parser_ng.cpp, después de validar que el paquete contiene al menos sizeof(ipv4_header_t) bytes (20 bytes), el código avanza el local_pointer en '4 * ipv4_header->get_ihl()' (línea 164) sin validar que (a) IHL >= 5 (el valor mínimo válido según RFC 791), o (b) 4 * IHL bytes estén realmente disponibles en el paquete. El campo IHL es de 4 bits, permitiendo valores de 0 a 15, por lo que el avance puede ser de 0 a 60 bytes. Un valor IHL de 15 con solo 20 bytes validados causa una lectura excesiva de 40 bytes. Un IHL de 0-4 hace que el puntero no avance más allá de la cabecera IP, lo que resulta en que la cabecera TCP/UDP se analice a partir de datos de la cabecera IP (confusión de tipos). Esta vulnerabilidad es alcanzable a través de cualquier interfaz de captura de paquetes."
    }
  ],
  "lastModified": "2026-07-22T19:10:00.120",
  "sourceIdentifier": "cve@mitre.org"
}