CVE-2021-4236

Estado: ModificadaCrítica (9.8)—

Gravedad9.8Crítica · CVSS 3.1

Probabilidad de explotación1.15 %mayor que el 67 % de las CVE

Explotación activaNono figura en el catálogo de CISA

Exploit públicoNo conocidosin código público localizado

Web Sockets no ejecuta ningún método AuthenticateMethod que pueda configurarse, lo que lleva a una desreferencia del puntero null si se supone que el puntero UserData devuelto no es null, o a una omisión de autenticación. Este problema solo afecta a WebSockets con un enlace AuthenticateMethod. Los controladores de solicitudes que no utilizan WebSockets explícitamente no son vulnerables.

CVSS

Puntuación base: 9.8
Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 1.15 %
Percentil entre todas las CVEs puntuadas: 67
Fecha de la puntuación: 21/10/2026

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)

WEB Project — WEB

CWE

CWE-476

Referencias

Mostrar las 4 referencias

JSON original (NVD)

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{
  "id": "CVE-2021-4236",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-4236",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-04-11T16:20:37.403821Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      },
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security@golang.org",
      "affectedData": [
        {
          "vendor": "github.com/ecnepsnai/web",
          "product": "github.com/ecnepsnai/web",
          "versions": [
            {
              "status": "affected",
              "version": "1.4.0",
              "lessThan": "1.5.2",
              "versionType": "semver"
            }
          ],
          "packageName": "github.com/ecnepsnai/web",
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "Server.socketHandler"
            },
            {
              "name": "Server.Socket"
            }
          ]
        }
      ]
    }
  ],
  "published": "2022-12-27T22:15:12.013",
  "references": [
    {
      "url": "https://github.com/ecnepsnai/web/commit/5a78f8d5c41ce60dcf9f61aaf47a7a8dc3e0002f",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "security@golang.org"
    },
    {
      "url": "https://pkg.go.dev/vuln/GO-2021-0107",
      "tags": [
        "Exploit",
        "Patch",
        "Third Party Advisory"
      ],
      "source": "security@golang.org"
    },
    {
      "url": "https://github.com/ecnepsnai/web/commit/5a78f8d5c41ce60dcf9f61aaf47a7a8dc3e0002f",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://pkg.go.dev/vuln/GO-2021-0107",
      "tags": [
        "Exploit",
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Web Sockets do not execute any AuthenticateMethod methods which may be set, leading to a nil pointer dereference if the returned UserData pointer is assumed to be non-nil, or authentication bypass. This issue only affects WebSockets with an AuthenticateMethod hook. Request handlers that do not explicitly use WebSockets are not vulnerable."
    },
    {
      "lang": "es",
      "value": "Web Sockets no ejecuta ningún método AuthenticateMethod que pueda configurarse, lo que lleva a una desreferencia del puntero null si se supone que el puntero UserData devuelto no es null, o a una omisión de autenticación. Este problema solo afecta a WebSockets con un enlace AuthenticateMethod. Los controladores de solicitudes que no utilizan WebSockets explícitamente no son vulnerables."
    }
  ],
  "lastModified": "2026-06-17T04:19:19.493",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:web_project:web:*:*:*:*:*:go:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4F957C53-3F68-4128-B6FA-7685D4949E2B",
              "versionEndExcluding": "1.5.2",
              "versionStartIncluding": "1.4.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@golang.org"
}