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CVE-2026-49842

Estado: AnalizadaAlta (7.5)—

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, mod_verto's WebSocket frame loop intercepts a #-prefixed speed-test protocol (#SPU / #SPB / #SPE) before any authentication check. The declared payload size in #SPU was parsed with atoi() and only rejected non-positive values, so an unauthenticated peer could request up to INT_MAX bytes. The server then wrote roughly size * 10 bytes back during the download phase, on the order of 20 GB per request, yielding strong outbound bandwidth amplification from a short request. This issue has been patched in version 1.11.1.

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 remota sin autenticación (PR:N, UI:N) en WebSocket de FreeSWITCH que amplifica tráfico de salida (~10x) causando DoS de disponibilidad por consumo de ancho de banda.

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)

Freeswitch — Freeswitch

CWE

Referencias

JSON original (NVD)

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          "timestamp": "2026-06-09T18:05:28.761050Z"
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      "value": "FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, mod_verto's WebSocket frame loop intercepts a #-prefixed speed-test protocol (#SPU / #SPB / #SPE) before any authentication check. The declared payload size in #SPU was parsed with atoi() and only rejected non-positive values, so an unauthenticated peer could request up to INT_MAX bytes. The server then wrote roughly size * 10 bytes back during the download phase, on the order of 20 GB per request, yielding strong outbound bandwidth amplification from a short request. This issue has been patched in version 1.11.1."
    },
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      "value": "FreeSWITCH es una Pila de Telecomunicaciones Definida por Software que permite la transformación digital de conmutadores de telecomunicaciones propietarios a una implementación de software que se ejecuta en cualquier hardware comercial. Antes de la versión 1.11.1, el bucle de tramas WebSocket de mod_verto intercepta un protocolo de prueba de velocidad con prefijo '#' (#SPU / #SPB / #SPE) antes de cualquier verificación de autenticación. El tamaño de la carga útil declarado en #SPU se analizó con atoi() y solo rechazó valores no positivos, por lo que un par no autenticado podría solicitar hasta INT_MAX bytes. El servidor luego escribió aproximadamente tamaño * 10 bytes de vuelta durante la fase de descarga, del orden de 20 GB por solicitud, lo que produce una fuerte amplificación del ancho de banda saliente a partir de una solicitud corta. Este problema ha sido parcheado en la versión 1.11.1."
    }
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  "lastModified": "2026-07-23T08:10:00.137",
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