{"api_version":"1","generated_at":"2026-05-13T00:06:35+00:00","cve":"CVE-2021-33604","urls":{"html":"https://cve.report/CVE-2021-33604","api":"https://cve.report/api/cve/CVE-2021-33604.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-33604","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-33604"},"summary":{"title":"CVE-2021-33604","description":"URL encoding error in development mode handler in com.vaadin:flow-server versions 2.0.0 through 2.6.1 (Vaadin 14.0.0 through 14.6.1), 3.0.0 through 6.0.9 (Vaadin 15.0.0 through 19.0.8) allows local user to execute arbitrary JavaScript code by opening crafted URL in browser.","state":"PUBLIC","assigner":"security@vaadin.com","published_at":"2021-06-24 12:15:00","updated_at":"2021-07-01 15:35:00"},"problem_types":["NVD-CWE-Other"],"metrics":[],"references":[{"url":"https://vaadin.com/security/cve-2021-33604","name":"https://vaadin.com/security/cve-2021-33604","refsource":"CONFIRM","tags":[],"title":"CVE-2021-33604: Reflected cross-site scripting in development mode handler in Vaadin 14, 15-19","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/vaadin/flow/pull/11099","name":"https://github.com/vaadin/flow/pull/11099","refsource":"CONFIRM","tags":[],"title":"fix: prevent passing bad character to dev-server by pleku · Pull Request #11099 · vaadin/flow · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-33604","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33604","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"33604","vulnerable":"1","versionEndIncluding":"2.6.1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"vaadin","cpe5":"flow-server","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"33604","vulnerable":"1","versionEndIncluding":"5.0.0","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"vaadin","cpe5":"flow-server","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"33604","vulnerable":"1","versionEndIncluding":"6.0.9","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"vaadin","cpe5":"flow-server","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"33604","vulnerable":"1","versionEndIncluding":"14.6.1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"vaadin","cpe5":"vaadin","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"33604","vulnerable":"1","versionEndIncluding":"18.0.0","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"vaadin","cpe5":"vaadin","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"33604","vulnerable":"1","versionEndIncluding":"19.0.8","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"vaadin","cpe5":"vaadin","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"security@vaadin.com","DATE_PUBLIC":"2021-06-24T09:55:00.000Z","ID":"CVE-2021-33604","STATE":"PUBLIC","TITLE":"Reflected cross-site scripting in development mode handler in Vaadin 14, 15-19"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Vaadin","version":{"version_data":[{"version_affected":">=","version_value":"14.0.0"},{"version_affected":"<=","version_value":"14.6.1"},{"version_affected":">=","version_value":"15.0.0"},{"version_affected":"<=","version_value":"19.0.8"}]}},{"product_name":"flow-server","version":{"version_data":[{"version_affected":">=","version_value":"2.0.0"},{"version_affected":"<=","version_value":"2.6.1"},{"version_affected":">=","version_value":"3.0.0"},{"version_affected":"<=","version_value":"6.0.9"}]}}]},"vendor_name":"Vaadin"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"URL encoding error in development mode handler in com.vaadin:flow-server versions 2.0.0 through 2.6.1 (Vaadin 14.0.0 through 14.6.1), 3.0.0 through 6.0.9 (Vaadin 15.0.0 through 19.0.8) allows local user to execute arbitrary JavaScript code by opening crafted URL in browser."}]},"generator":{"engine":"Vulnogram 0.0.9"},"impact":{"cvss":{"attackComplexity":"HIGH","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":2.5,"baseSeverity":"LOW","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-172 Encoding Error"}]}]},"references":{"reference_data":[{"name":"https://vaadin.com/security/cve-2021-33604","refsource":"CONFIRM","url":"https://vaadin.com/security/cve-2021-33604"},{"name":"https://github.com/vaadin/flow/pull/11099","refsource":"CONFIRM","url":"https://github.com/vaadin/flow/pull/11099"}]},"source":{"discovery":"INTERNAL"}},"nvd":{"publishedDate":"2021-06-24 12:15:00","lastModifiedDate":"2021-07-01 15:35:00","problem_types":["NVD-CWE-Other"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N","attackVector":"LOCAL","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE","baseScore":2.5,"baseSeverity":"LOW"},"exploitabilityScore":1,"impactScore":1.4},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:L/AC:H/Au:N/C:P/I:N/A:N","accessVector":"LOCAL","accessComplexity":"HIGH","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"NONE","availabilityImpact":"NONE","baseScore":1.2},"severity":"LOW","exploitabilityScore":1.9,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":true}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:vaadin:vaadin:*:*:*:*:*:*:*:*","versionStartIncluding":"15.0.0","versionEndIncluding":"18.0.0","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:vaadin:vaadin:*:*:*:*:*:*:*:*","versionStartIncluding":"19.0.0","versionEndIncluding":"19.0.8","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:vaadin:vaadin:*:*:*:*:*:*:*:*","versionStartIncluding":"14.0.0","versionEndIncluding":"14.6.1","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:vaadin:flow-server:*:*:*:*:*:*:*:*","versionStartIncluding":"2.0.0","versionEndIncluding":"2.6.1","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:vaadin:flow-server:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0.0","versionEndIncluding":"6.0.9","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:vaadin:flow-server:*:*:*:*:*:*:*:*","versionStartIncluding":"3.0.0","versionEndIncluding":"5.0.0","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"33604","Ordinal":"209014","Title":"CVE-2021-33604","CVE":"CVE-2021-33604","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"33604","Ordinal":"1","NoteData":"URL encoding error in development mode handler in com.vaadin:flow-server versions 2.0.0 through 2.6.1 (Vaadin 14.0.0 through 14.6.1), 3.0.0 through 6.0.9 (Vaadin 15.0.0 through 19.0.8) allows local user to execute arbitrary JavaScript code by opening crafted URL in browser.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"33604","Ordinal":"2","NoteData":"2021-06-24","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"33604","Ordinal":"3","NoteData":"2021-06-24","Type":"Other","Title":"Modified"}]}}}