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CVE-2024-30255

Estado: ModificadaAlta (7.5)—💥 PoC

Envoy is a cloud-native, open source edge and service proxy. The HTTP/2 protocol stack in Envoy versions prior to 1.29.3, 1.28.2, 1.27.4, and 1.26.8 are vulnerable to CPU exhaustion due to flood of CONTINUATION frames. Envoy's HTTP/2 codec allows the client to send an unlimited number of CONTINUATION frames even after exceeding Envoy's header map limits. This allows an attacker to send a sequence of CONTINUATION frames without the END_HEADERS bit set causing CPU utilization, consuming approximately 1 core per 300Mbit/s of traffic and culminating in denial of service through CPU exhaustion.

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Users should upgrade to version 1.29.3, 1.28.2, 1.27.4, or 1.26.8 to mitigate the effects of the CONTINUATION flood. As a workaround, disable HTTP/2 protocol for downstream connections.

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).

💥 Exploits públicos

Hay código de explotación o plantillas de detección públicos. No es lo mismo que explotación activa confirmada (KEV), pero aumenta el riesgo: parchee con prioridad.

⚠️ Las pruebas de concepto de GitHub no están verificadas: algunas son falsas o contienen malware. No las ejecute nunca fuera de un laboratorio aislado.

Tecnologías afectadas (1)

Envoyproxy — Envoy

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2024-30255",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-30255",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-04-08T14:58:49.679014Z"
        }
      }
    ],
    "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
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
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  "affected": [
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          "product": "envoy",
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              "version": ">= 1.29.0, < 1.29.3"
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            {
              "status": "affected",
              "version": ">= 1.28.0, < 1.28.2"
            },
            {
              "status": "affected",
              "version": ">= 1.27.0, < 1.27.4"
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      "affectedData": [
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          "product": "envoy",
          "versions": [
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              "status": "affected",
              "version": "1.29.0",
              "lessThan": "1.29.3",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "1.28.0",
              "lessThan": "1.28.2",
              "versionType": "custom"
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            {
              "status": "affected",
              "version": "1.27.0",
              "lessThan": "1.27.4",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "0",
              "lessThan": "1.26.8",
              "versionType": "custom"
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          "defaultStatus": "unknown"
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  ],
  "published": "2024-04-04T20:15:08.983",
  "references": [
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      "url": "http://www.openwall.com/lists/oss-security/2024/04/03/16",
      "tags": [
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      "tags": [
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      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-j654-3ccm-vfmm",
      "tags": [
        "Patch",
        "Third Party Advisory"
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      "source": "security-advisories@github.com"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "url": "https://www.kb.cert.org/vuls/id/421644",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-390"
        }
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    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Envoy is a cloud-native, open source edge and service proxy. The HTTP/2 protocol stack in Envoy versions prior to 1.29.3, 1.28.2, 1.27.4, and 1.26.8 are vulnerable to CPU exhaustion due to flood of CONTINUATION frames. Envoy's HTTP/2 codec allows the client to send an unlimited number of CONTINUATION frames even after exceeding Envoy's header map limits. This allows an attacker to send a sequence of CONTINUATION frames without the END_HEADERS bit set causing CPU utilization, consuming approximately 1 core per 300Mbit/s of traffic and culminating in denial of service through CPU exhaustion. Users should upgrade to version 1.29.3, 1.28.2, 1.27.4, or 1.26.8 to mitigate the effects of the CONTINUATION flood. As a workaround, disable HTTP/2 protocol for downstream connections."
    },
    {
      "lang": "es",
      "value": "Envoy es un proxy de servicio y borde de código abierto, nativo de la nube. La pila de protocolos HTTP/2 en las versiones de Envoy anteriores a 1.29.3, 1.28.2, 1.27.4 y 1.26.8 son vulnerables al agotamiento de la CPU debido a la inundación de tramas de CONTINUACIÓN. El códec HTTP/2 de Envoy permite al cliente enviar un número ilimitado de tramas de CONTINUACIÓN incluso después de exceder los límites del mapa de encabezado de Envoy. Esto permite a un atacante enviar una secuencia de tramas CONTINUATION sin que el bit END_HEADERS esté configurado causando la utilización de la CPU, consumiendo aproximadamente 1 núcleo por cada 300 Mbit/s de tráfico y culminando en una denegación de servicio por agotamiento de la CPU. Los usuarios deben actualizar a la versión 1.29.3, 1.28.2, 1.27.4 o 1.26.8 para mitigar los efectos de la inundación de CONTINUACIÓN. Como workaround, deshabilite el protocolo HTTP/2 para conexiones descendentes."
    }
  ],
  "lastModified": "2026-06-17T07:26:36.947",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "versionEndExcluding": "1.26.8"
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              "versionEndExcluding": "1.27.4",
              "versionStartIncluding": "1.27.0"
            },
            {
              "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8B67040F-7B64-4A8B-A13B-E8A9CD473261",
              "versionEndExcluding": "1.28.2",
              "versionStartIncluding": "1.28.0"
            },
            {
              "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4088E7B5-1E46-43E3-8E9E-1B01C5070642",
              "versionEndExcluding": "1.29.3",
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            }
          ],
          "operator": "OR"
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  "sourceIdentifier": "security-advisories@github.com"
}