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CVE-2021-22963

Estado: ModificadaMedia (6.1)—

A redirect vulnerability in the fastify-static module version < 4.2.4 allows remote attackers to redirect users to arbitrary websites via a double slash // followed by a domain: http://localhost:3000//google.com/%2e%2e.The issue shows up on all the fastify-static applications that set redirect: true option. By default, it is false.

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)

Fastify — Fastify-static

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-22963",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 4.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 6.1,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "support@hackerone.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "https://github.com/fastify/fastify-static",
          "versions": [
            {
              "status": "affected",
              "version": "Affects < v4.2.4. Fixed in >= v4.2.4"
            }
          ]
        }
      ]
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  ],
  "published": "2021-10-14T15:15:08.877",
  "references": [
    {
      "url": "https://hackerone.com/reports/1354255",
      "tags": [
        "Exploit",
        "Issue Tracking",
        "Third Party Advisory"
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    },
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      "url": "https://hackerone.com/reports/1354255",
      "tags": [
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        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "support@hackerone.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-601"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-601"
        }
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    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A redirect vulnerability in the fastify-static module version < 4.2.4 allows remote attackers to redirect users to arbitrary websites via a double slash // followed by a domain: http://localhost:3000//google.com/%2e%2e.The issue shows up on all the fastify-static applications that set redirect: true option. By default, it is false."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de redirección en el módulo fastify-static versiones anteriores a 4.2.4, permite a atacantes remotos redirigir a usuarios a sitios web arbitrarios por medio de una doble barra // seguida de un dominio: http://localhost:3000//google.com/%2e%2e. El problema aparece en todas las aplicaciones fastify-static que establecen la opción redirect: true. Por defecto, es false"
    }
  ],
  "lastModified": "2026-06-17T03:38:07.070",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:fastify:fastify-static:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BF3A214C-ECD9-4CA4-AD5A-690F565815B2",
              "versionEndExcluding": "4.2.4"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "support@hackerone.com"
}