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CVE-2026-37235

Estado: AnalizadaAlta (7.5)—

FlexRIC v2.0.0 trusts the xapp_id field from E42 message payloads without binding it to the sender's SCTP association. The validation function valid_xapp_id() only checks that the value is within the assigned range. A remote unauthenticated attacker can impersonate any xApp by specifying their xapp_id in requests sent to the iApp (port 36422), causing responses to be misrouted to the victim xApp. This can crash the victim xApp, the RIC, or the iApp itself through state inconsistencies in the red-black tree data structure.

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.

Vulnerabilidad en aplicación expuesta (FlexRIC puerto 36422) explotable sin autenticación vía red; causa DoS por crash mediante manipulación de payload E42 sin validación de asociación SCTP.

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

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (1)

Mosaic5g — Flexric

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-37235",
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          "role": "CISA Coordinator",
          "options": [
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          "version": "2.0.3",
          "timestamp": "2026-06-02T15:51:55.357895Z"
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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  "published": "2026-06-01T19:16:33.850",
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      "url": "https://github.com/MinamiKotor1/oran-security-advisories-zhongnan-luo/blob/main/advisories/CVE-2026-37235.md",
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    },
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      "value": "FlexRIC v2.0.0 confía en el campo xapp_id de las cargas útiles de los mensajes E42 sin vincularlo a la asociación SCTP del remitente. La función de validación valid_xapp_id() solo verifica que el valor está dentro del rango asignado. Un atacante remoto no autenticado puede suplantar a cualquier xApp al especificar su xapp_id en las solicitudes enviadas a la iApp (puerto 36422), lo que provoca que las respuestas se enruten incorrectamente a la xApp víctima. Esto puede provocar la caída de la xApp víctima, el RIC o la propia iApp a través de inconsistencias de estado en la estructura de datos de árbol rojo-negro."
    }
  ],
  "lastModified": "2026-07-22T07:10:00.107",
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