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CVE-2024-23326

Estado: ModificadaAlta (8.2)—

Envoy is a cloud-native, open source edge and service proxy. A theoretical request smuggling vulnerability exists through Envoy if a server can be tricked into adding an upgrade header into a response. Per RFC https://www.rfc-editor.org/rfc/rfc7230#section-6.7 a server sends 101 when switching protocols. Envoy incorrectly accepts a 200 response from a server when requesting a protocol upgrade, but 200 does not indicate protocol switch. This opens up the possibility of request smuggling through Envoy if the server can be tricked into adding the upgrade header to the response.

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)

Envoyproxy — Envoy

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2024-23326",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-23326",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-07-19T12:32:08.718611Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.9,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.2
      },
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        "type": "Primary",
        "source": "nvd@nist.gov",
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          "attackVector": "NETWORK",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
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          "confidentialityImpact": "HIGH"
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  "affected": [
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        {
          "vendor": "envoyproxy",
          "product": "envoy",
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              "status": "affected",
              "version": ">= 1.13.0, <= 1.30.1"
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              "status": "affected",
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              "status": "affected",
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  ],
  "published": "2024-06-04T21:15:33.440",
  "references": [
    {
      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-vcf8-7238-v74c",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-vcf8-7238-v74c",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
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          "value": "CWE-391"
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    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-444"
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  "descriptions": [
    {
      "lang": "en",
      "value": "Envoy is a cloud-native, open source edge and service proxy. A theoretical request smuggling vulnerability exists through Envoy if a server can be tricked into adding an upgrade header into a response. Per RFC https://www.rfc-editor.org/rfc/rfc7230#section-6.7 a server sends 101 when switching protocols. Envoy incorrectly accepts a 200 response from a server when requesting a protocol upgrade, but 200 does not indicate protocol switch. This opens up the possibility of request smuggling through Envoy if the server can be tricked into adding the upgrade header to the response.\n\n"
    },
    {
      "lang": "es",
      "value": "Envoy es un proxy de servicio y borde de código abierto, nativo de la nube. Existe una vulnerabilidad teórica de contrabando de solicitudes a través de Envoy si se puede engañar a un servidor para que agregue un encabezado de actualización en una respuesta. Según RFC https://www.rfc-editor.org/rfc/rfc7230#section-6.7, un servidor envía 101 al cambiar de protocolo. Envoy acepta incorrectamente una respuesta 200 de un servidor cuando solicita una actualización de protocolo, pero 200 no indica un cambio de protocolo. Esto abre la posibilidad de contrabando de solicitudes a través de Envoy si se puede engañar al servidor para que agregue el encabezado de actualización a la respuesta."
    }
  ],
  "lastModified": "2026-06-17T07:12:36.077",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "1.27.6"
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