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CVE-2021-43824

Estado: ModificadaAlta (7.5)—

Envoy is an open source edge and service proxy, designed for cloud-native applications. In affected versions a crafted request crashes Envoy when a CONNECT request is sent to JWT filter configured with regex match. This provides a denial of service attack vector. The only workaround is to not use regex in the JWT filter. Users are advised to upgrade.

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)

Mostrar
{
  "id": "CVE-2021-43824",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-43824",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2025-04-23T15:57:27.390383Z"
        }
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    "cvssMetricV2": [
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        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "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",
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        "exploitabilityScore": 3.9
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          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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      }
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  "affected": [
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          "vendor": "envoyproxy",
          "product": "envoy",
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              "status": "affected",
              "version": ">= 1.20.0, < 1.20.2"
            },
            {
              "status": "affected",
              "version": ">= 1.19.0, < 1.19.3"
            },
            {
              "status": "affected",
              "version": "< 1.18.6"
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              "status": "affected",
              "version": ">= 1.21.0, < 1.21.1"
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  ],
  "published": "2022-02-22T23:15:10.813",
  "references": [
    {
      "url": "https://github.com/envoyproxy/envoy/commit/9371333230b1a6e1be2eccf4868771e11af6253a",
      "tags": [
        "Patch",
        "Third Party Advisory"
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      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-vj5m-rch8-5r2p",
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      "tags": [
        "Patch",
        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
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      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-vj5m-rch8-5r2p",
      "tags": [
        "Issue Tracking",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Envoy is an open source edge and service proxy, designed for cloud-native applications. In affected versions a crafted request crashes Envoy when a CONNECT request is sent to JWT filter configured with regex match. This provides a denial of service attack vector. The only workaround is to not use regex in the JWT filter. Users are advised to upgrade."
    },
    {
      "lang": "es",
      "value": "Envoy es un proxy de borde y servicio de código abierto, diseñado para aplicaciones nativas de la nube. En las versiones afectadas, una solicitud crafteada bloquea Envoy cuando se envía una solicitud CONNECT al filtro JWT configurado con coincidencia regex. Esto proporciona un vector de ataque de denegación de servicio. La única medida de mitigación es no utilizar regex en el filtro JWT. Se aconseja a los usuarios que actualicen"
    }
  ],
  "lastModified": "2026-06-17T04:11:30.997",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
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              "versionEndExcluding": "1.18.6"
            },
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              "vulnerable": true,
              "matchCriteriaId": "2812AC62-44B5-4077-862D-A221CD88981D",
              "versionEndExcluding": "1.19.3",
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}