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CVE-2021-22902

Estado: ModificadaAlta (7.5)—

The actionpack ruby gem (a framework for handling and responding to web requests in Rails) before 6.0.3.7, 6.1.3.2 suffers from a possible denial of service vulnerability in the Mime type parser of Action Dispatch. Carefully crafted Accept headers can cause the mime type parser in Action Dispatch to do catastrophic backtracking in the regular expression engine.

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)

Rubyonrails — Rails

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-22902",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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    "cvssMetricV31": [
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          "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",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
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  },
  "affected": [
    {
      "source": "support@hackerone.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "https://github.com/rails/rails",
          "versions": [
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              "status": "affected",
              "version": "Fixed in 6.0.3.7, 6.1.3.2"
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  "published": "2021-06-11T16:15:11.360",
  "references": [
    {
      "url": "https://discuss.rubyonrails.org/t/cve-2021-22902-possible-denial-of-service-vulnerability-in-action-dispatch/77866",
      "tags": [
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    {
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "support@hackerone.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
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    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "NVD-CWE-noinfo"
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The actionpack ruby gem (a framework for handling and responding to web requests in Rails) before 6.0.3.7, 6.1.3.2 suffers from a possible denial of service vulnerability in the Mime type parser of Action Dispatch. Carefully crafted Accept headers can cause the mime type parser in Action Dispatch to do catastrophic backtracking in the regular expression engine."
    },
    {
      "lang": "es",
      "value": "El actionpack ruby gem (un marco de trabajo para manejar y responder a peticiones web en Rails) versiones anteriores a 6.0.3.7, 6.1.3.2 sufre de una posible vulnerabilidad de denegación de servicio en el analizador de tipos Mime de Action Dispatch. Unas cabeceras Accept cuidadosamente diseñadas pueden hacer que el analizador de tipos mime de Action Dispatch realice un retroceso catastrófico en el motor de expresiones regulares"
    }
  ],
  "lastModified": "2026-06-17T03:37:59.480",
  "configurations": [
    {
      "nodes": [
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          "negate": false,
          "cpeMatch": [
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              "versionEndExcluding": "6.0.3.7",
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            },
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          "operator": "OR"
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  "sourceIdentifier": "support@hackerone.com"
}