{
  "id": "CVE-2021-31406",
  "sourceIdentifier": "security@vaadin.com",
  "published": "2021-04-23T16:15:08.727",
  "lastModified": "2021-04-30T19:01:08.797",
  "vulnStatus": "Analyzed",
  "descriptions": [
    {
      "lang": "en",
      "value": "Non-constant-time comparison of CSRF tokens in endpoint request handler in com.vaadin:flow-server versions 3.0.0 through 5.0.3 (Vaadin 15.0.0 through 18.0.6), and com.vaadin:fusion-endpoint version 6.0.0 (Vaadin 19.0.0) allows attacker to guess a security token for Fusion endpoints via timing attack."
    },
    {
      "lang": "es",
      "value": "La comparaci\u00f3n non-constant-time de tokens CSRF en el manejador de peticiones de endpoint en com.vaadin:flow-server versiones 3.0.0 hasta 5.0.3 (Vaadin versiones 15.0.0 hasta 18.0.6) y com.vaadin:fusion-endpoint versi\u00f3n 6.0.0 (Vaadin versi\u00f3n 19.0.0), permite al atacante adivinar un token de seguridad para los endpoints de Fusion por medio de un ataque de sincronizaci\u00f3n"
    }
  ],
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          "attackVector": "LOCAL",
          "attackComplexity": "HIGH",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 2.5,
          "baseSeverity": "LOW"
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        "exploitabilityScore": 1.0,
        "impactScore": 1.4
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        "type": "Secondary",
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          "accessVector": "LOCAL",
          "accessComplexity": "MEDIUM",
          "authentication": "NONE",
          "confidentialityImpact": "PARTIAL",
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        "baseSeverity": "LOW",
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  },
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      "description": [
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          "value": "CWE-203"
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      "source": "security@vaadin.com",
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      "description": [
        {
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          "value": "CWE-208"
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  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:vaadin:flow:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "3.0.0",
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  "references": [
    {
      "url": "https://github.com/vaadin/flow/pull/10157",
      "source": "security@vaadin.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://vaadin.com/security/cve-2021-31406",
      "source": "security@vaadin.com",
      "tags": [
        "Vendor Advisory"
      ]
    }
  ]
}