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CVE-2025-4820

Estado: AnalizadaMedia (5.3)—

Impact

Cloudflare quiche was discovered to be vulnerable to incorrect congestion window growth, which could cause it to send data at a rate faster than the path might actually support.

An unauthenticated remote attacker can exploit the vulnerability by first completing a handshake and initiating a congestion-controlled data transfer towards itself. Then, it could manipulate the victim's congestion control state by sending ACK frames exercising an opportunistic ACK attack; see RFC 9000 Section 21.4. The victim could grow the congestion window beyond typical expectations and allow more bytes in flight than the path might really support.

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Patches

quiche 0.24.4 is the earliest version containing the fix for this issue.

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)

Cloudflare — Quiche

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-4820",
  "cveTags": [],
  "metrics": {
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          "id": "CVE-2025-4820",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
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          ],
          "version": "2.0.3",
          "timestamp": "2025-06-18T18:27:27.515226Z"
        }
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          "integrityImpact": "NONE",
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          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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  "published": "2025-06-18T16:15:28.403",
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      "value": "Impact\n\nCloudflare quiche was discovered to be vulnerable to incorrect congestion window growth, which could cause it to send data at a rate faster than the path might actually support.\n\nAn unauthenticated remote attacker can exploit the vulnerability by first completing a handshake and initiating a congestion-controlled data transfer towards itself. Then, it could manipulate the victim's congestion control state by sending ACK frames exercising an opportunistic ACK attack; see RFC 9000 Section 21.4. The victim could grow the congestion window beyond typical expectations and allow more bytes in flight than the path might really support.\n\n\n\nPatches\n\n\nquiche 0.24.4 is the earliest version containing the fix for this issue."
    },
    {
      "lang": "es",
      "value": "Se descubrió que Quiche de Cloudflare era vulnerable a un crecimiento incorrecto de la ventana de congestión, lo que podría provocar que enviara datos a una velocidad superior a la que la ruta realmente admite. Un atacante remoto no autenticado puede explotar esta vulnerabilidad completando primero un protocolo de enlace e iniciando una transferencia de datos controlada por congestión hacia sí mismo. Posteriormente, podría manipular el estado de control de congestión de la víctima enviando tramas ACK, lo que implica un ataque ACK oportunista (véase RFC 9000, sección 21.4). La víctima podría aumentar la ventana de congestión más allá de lo esperado y permitir más bytes en tránsito de los que la ruta realmente admite. La versión 0.24.4 de Quiche es la más reciente que corrige este problema."
    }
  ],
  "lastModified": "2026-06-17T09:34:05.110",
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