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CVE-2024-23324

Status: ModifiedHigh (7.5)—

Envoy is a high-performance edge/middle/service proxy. External authentication can be bypassed by downstream connections. Downstream clients can force invalid gRPC requests to be sent to ext_authz, circumventing ext_authz checks when failure_mode_allow is set to true. This issue has been addressed in released 1.29.1, 1.28.1, 1.27.3, and 1.26.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Envoyproxy — Envoy

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2024-23324",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-23324",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-08-19T16:10:39.029109Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 8.6,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 4,
        "exploitabilityScore": 3.9
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
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      }
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  "affected": [
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      "source": "security-advisories@github.com",
      "affectedData": [
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          "product": "envoy",
          "versions": [
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            {
              "status": "affected",
              "version": ">= 1.28.0, < 1.28.1"
            },
            {
              "status": "affected",
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      "affectedData": [
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          "product": "envoy",
          "versions": [
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              "status": "affected",
              "version": "1.29.0",
              "lessThan": "1.29.1",
              "versionType": "custom"
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            {
              "status": "affected",
              "version": "1.28.0",
              "lessThan": "1.28.1",
              "versionType": "custom"
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            {
              "status": "affected",
              "version": "1.27.0",
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              "version": "0",
              "lessThan": "1.26.7",
              "versionType": "custom"
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          "defaultStatus": "unknown"
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  ],
  "published": "2024-02-09T23:15:09.223",
  "references": [
    {
      "url": "https://github.com/envoyproxy/envoy/commit/29989f6cc8bfd8cd2ffcb7c42711eb02c7a5168a",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-gq3v-vvhj-96j6",
      "tags": [
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      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/envoyproxy/envoy/commit/29989f6cc8bfd8cd2ffcb7c42711eb02c7a5168a",
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        "Vendor Advisory"
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      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-gq3v-vvhj-96j6",
      "tags": [
        "Vendor Advisory"
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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": [
        {
          "lang": "en",
          "value": "CWE-20"
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    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
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    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Envoy is a high-performance edge/middle/service proxy. External authentication can be bypassed by downstream connections. Downstream clients can force invalid gRPC requests to be sent to ext_authz, circumventing ext_authz checks when failure_mode_allow is set to true. This issue has been addressed in released 1.29.1, 1.28.1, 1.27.3, and 1.26.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.\n"
    },
    {
      "lang": "es",
      "value": "Envoy es un proxy de servicio/intermedio/perimetral de alto rendimiento. La autenticación externa se puede omitir mediante conexiones descendentes. Los clientes intermedios pueden forzar el envío de solicitudes gRPC no válidas a ext_authz, eludiendo las comprobaciones de ext_authz cuando Failure_mode_allow se establece en verdadero. Este problema se solucionó en las versiones 1.29.1, 1.28.1, 1.27.3 y 1.26.7. Se recomienda a los usuarios que actualicen. No se conocen workarounds para esta vulnerabilidad."
    }
  ],
  "lastModified": "2026-06-17T07:12:35.810",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
              "vulnerable": true,
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              "versionEndExcluding": "1.26.7",
              "versionStartIncluding": "1.26.0"
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  "sourceIdentifier": "security-advisories@github.com"
}