{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2021-31404",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-31404",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2021-04-23T16:05:41.141Z",
    "updatedAt": "2024-09-16T23:46:26.136Z",
    "importedAt": "2026-10-24T01:56:32.228Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "Timing side channel vulnerability in UIDL request handler in Vaadin 10, 11-14, and 15-18",
      "summary": "Non-constant-time comparison of CSRF tokens in UIDL request handler in com.vaadin:flow-server versions 1.0.0 through 1.0.13 (Vaadin 10.0.0 through 10.0.16), 1.1.0 prior to 2.0.0 (Vaadin 11 prior to 14), 2.0.0 through 2.4.6 (Vaadin 14.0.0 through 14.4.6), 3.0.0 prior to 5.0.0 (Vaadin 15 prior to 18), and 5.0.0 through 5.0.2 (Vaadin 18.0.0 through 18.0.5) allows attacker to guess a security token via timing attack.",
      "affected": [
        {
          "vendor": "Vaadin",
          "product": "Vaadin",
          "versions": [
            {
              "version": "10.0.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "*",
              "changes": [
                {
                  "at": "11.0.0",
                  "status": "affected"
                },
                {
                  "at": "14.0.0",
                  "status": "unaffected"
                },
                {
                  "at": "14.0.0",
                  "status": "affected"
                },
                {
                  "at": "15.0.0",
                  "status": "affected"
                },
                {
                  "at": "18.0.0",
                  "status": "unaffected"
                },
                {
                  "at": "18.0.0",
                  "status": "affected"
                }
              ]
            }
          ]
        },
        {
          "vendor": "Vaadin",
          "product": "flow-server",
          "versions": [
            {
              "version": "1.0.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "*",
              "changes": [
                {
                  "at": "1.1.0",
                  "status": "affected"
                },
                {
                  "at": "2.0.0",
                  "status": "unaffected"
                },
                {
                  "at": "2.0.0",
                  "status": "affected"
                },
                {
                  "at": "3.0.0",
                  "status": "affected"
                },
                {
                  "at": "5.0.0",
                  "status": "unaffected"
                },
                {
                  "at": "5.0.0",
                  "status": "affected"
                }
              ]
            }
          ]
        }
      ]
    }
  }
}