{"id":"CVE-2021-31403","aliases":["GHSA-75xc-qvxh-27f8"],"url":"https://o3.security/vulnerability/CVE-2021-31403","summary":"Timing side channel vulnerability in UIDL request handler in Vaadin 7 and 8","details":"Non-constant-time comparison of CSRF tokens in UIDL request handler in com.vaadin:vaadin-server versions 7.0.0 through 7.7.23 (Vaadin 7.0.0 through 7.7.23), and 8.0.0 through 8.12.2 (Vaadin 8.0.0 through 8.12.2) allows attacker to guess a security token via timing attack","published":"2021-04-23T16:15:08.600Z","modified":"2026-07-15T10:07:35.750284Z","cvss":{"score":2.5,"severity":"LOW","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"com.vaadin:vaadin-bom","fixedVersion":"7.7.24"},{"ecosystem":"Maven","name":"com.vaadin:vaadin-bom","fixedVersion":"8.12.3"},{"ecosystem":"Maven","name":"com.vaadin:vaadin-server","fixedVersion":"7.7.24"},{"ecosystem":"Maven","name":"com.vaadin:vaadin-server","fixedVersion":"8.12.3"}],"fix":{"url":"https://github.com/vaadin/framework/pull/12188","label":"vaadin/framework#12188"},"references":[{"type":"ADVISORY","url":"https://vaadin.com/security/cve-2021-31403"},{"type":"FIX","url":"https://github.com/vaadin/framework/pull/12188"},{"type":"FIX","url":"https://github.com/vaadin/framework/pull/12190"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T10:07:35.750284Z"}}