{"cve":"CVE-2021-31409","nvd":{"published":"2021-05-06T13:15:12.633","modified":"2026-06-17T03:51:43.710","status":"Modified","description":"Unsafe validation RegEx in EmailValidator component in com.vaadin:vaadin-compatibility-server versions 8.0.0 through 8.12.4 (Vaadin versions 8.0.0 through 8.12.4) allows attackers to cause uncontrolled resource consumption by submitting malicious email addresses.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400"],"references":["https://github.com/vaadin/framework/issues/12240","https://github.com/vaadin/framework/pull/12241","https://vaadin.com/security/cve-2021-31409","https://github.com/vaadin/framework/issues/12240","https://github.com/vaadin/framework/pull/12241"],"products":["vaadin:vaadin"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-31409","score":0.01672,"percentile":0.76814,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-c332-w4jm-55wv","url":"https://osv.dev/vulnerability/GHSA-c332-w4jm-55wv","summary":"Regular expression Denial of Service (ReDoS) in EmailValidator class in V7 compatibility module in Vaadin 8","modified":"2023-11-08T04:05:48.467420Z","packages":[{"ecosystem":"Maven","name":"com.vaadin:vaadin-compatibility-server","purl":"pkg:maven/com.vaadin/vaadin-compatibility-server","ranges":[">=8.0.0 <8.13.0"],"fixed":["8.13.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}