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CVE-2020-5404

Status: ModifiedMedium (5.9)—

The HttpClient from Reactor Netty, versions 0.9.x prior to 0.9.5, and versions 0.8.x prior to 0.8.16, may be used incorrectly, leading to a credentials leak during a redirect to a different domain. In order for this to happen, the HttpClient must have been explicitly configured to follow redirects.

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)

Broadcom — Reactor Netty

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2020-5404",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.9,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:S/C:P/I:P/A:N",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 4.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 6.8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Secondary",
        "source": "security@pivotal.io",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.0",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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        "impactScore": 4.7,
        "exploitabilityScore": 1.3
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
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        "cvssData": {
          "scope": "UNCHANGED",
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          "integrityImpact": "LOW",
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          "confidentialityImpact": "HIGH"
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  "affected": [
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      "affectedData": [
        {
          "vendor": "Pivotal",
          "product": "Reactor Netty",
          "versions": [
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              "status": "affected",
              "version": "0.8",
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              "versionType": "custom"
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              "versionType": "custom"
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  ],
  "published": "2020-03-03T18:15:12.157",
  "references": [
    {
      "url": "https://pivotal.io/security/cve-2020-5404",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@pivotal.io"
    },
    {
      "url": "https://pivotal.io/security/cve-2020-5404",
      "tags": [
        "Vendor Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "security@pivotal.io",
      "description": [
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          "lang": "en",
          "value": "CWE-522"
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    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-522"
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The HttpClient from Reactor Netty, versions 0.9.x prior to 0.9.5, and versions 0.8.x prior to 0.8.16, may be used incorrectly, leading to a credentials leak during a redirect to a different domain. In order for this to happen, the HttpClient must have been explicitly configured to follow redirects."
    },
    {
      "lang": "es",
      "value": "El HttpClient del Reactor Netty, versiones 0.9.x anteriores a 0.9.5, y versiones 0.8.x anteriores a 0.8.16, puede ser usado incorrectamente, conllevando a un filtrado de credenciales durante un redireccionamiento hacia un dominio diferente. A fin de que esto ocurra, el HttpClient debe haber sido configurado explícitamente para seguir los redireccionamientos."
    }
  ],
  "lastModified": "2026-09-04T18:59:12.370",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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}