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CVE-2026-49843

Estado: AnalizadaMedia (5.3)—

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 JSON-RPC handler bound the connection to the client-supplied sessid on the first frame, before the authentication gate. Binding inserts the connection into the global session hash and, on a key collision, drops the prior occupant of that slot — sending it a verto.punt, detaching its calls, and closing its socket. An unauthenticated network attacker who knows a target session UUID could therefore evict the legitimate client. 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).

Tecnologías afectadas (1)

Freeswitch — Freeswitch

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-49843",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-49843",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-10T13:46:43.345537Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "signalwire",
          "product": "freeswitch",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.11.1"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-06-09T17:17:48.170",
  "references": [
    {
      "url": "https://github.com/signalwire/freeswitch/releases/tag/v1.11.1",
      "tags": [
        "Release Notes"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/signalwire/freeswitch/security/advisories/GHSA-9457-fxr9-x78m",
      "tags": [
        "Third Party Advisory"
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      "source": "security-advisories@github.com"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "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 JSON-RPC handler bound the connection to the client-supplied sessid on the first frame, before the authentication gate. Binding inserts the connection into the global session hash and, on a key collision, drops the prior occupant of that slot — sending it a verto.punt, detaching its calls, and closing its socket. An unauthenticated network attacker who knows a target session UUID could therefore evict the legitimate client. This issue has been patched in version 1.11.1."
    },
    {
      "lang": "es",
      "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 gestor JSON-RPC de mod_verto vinculaba la conexión al sessid proporcionado por el cliente en el primer fotograma, antes de la puerta de autenticación. La vinculación inserta la conexión en la tabla hash global de sesiones y, en caso de colisión de clave, elimina al ocupante anterior de esa ranura - enviándole un verto.punt, desvinculando sus llamadas y cerrando su socket. Un atacante de red no autenticado que conoce un UUID de sesión objetivo podría, por lo tanto, expulsar al cliente legítimo. Este problema ha sido parcheado en la versión 1.11.1."
    }
  ],
  "lastModified": "2026-07-23T08:10:00.137",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:freeswitch:freeswitch:*:*:*:*:*:*:*:*",
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              "matchCriteriaId": "E8AED0D0-D5A1-4AA1-9CAE-13830B74CAC5",
              "versionEndExcluding": "1.11.1"
            }
          ],
          "operator": "OR"
        }
      ]
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  ],
  "sourceIdentifier": "security-advisories@github.com"
}