{"cve":"CVE-2021-31403","nvd":{"published":"2021-04-23T16:15:08.600","modified":"2026-06-17T03:51:42.837","status":"Modified","description":"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","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","score":2.5},"cwes":["CWE-203","CWE-208"],"references":["https://github.com/vaadin/framework/pull/12188","https://github.com/vaadin/framework/pull/12190","https://vaadin.com/security/cve-2021-31403","https://github.com/vaadin/framework/pull/12188","https://github.com/vaadin/framework/pull/12190"],"products":["vaadin:vaadin"],"source":"nvd","synced_at":"2026-10-19T21:17:01.373894544+00:00"},"epss":{"cve":"CVE-2021-31403","score":0.00306,"percentile":0.23392,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-75xc-qvxh-27f8","url":"https://osv.dev/vulnerability/GHSA-75xc-qvxh-27f8","summary":"Timing side channel vulnerability in UIDL request handler in Vaadin 7 and 8","modified":"2023-11-08T04:05:48.098329Z","packages":[{"ecosystem":"Maven","name":"com.vaadin:vaadin-bom","purl":"pkg:maven/com.vaadin/vaadin-bom","ranges":[">=7.0.0 <7.7.24"],"fixed":["7.7.24"]},{"ecosystem":"Maven","name":"com.vaadin:vaadin-bom","purl":"pkg:maven/com.vaadin/vaadin-bom","ranges":[">=8.0.0 <8.12.3"],"fixed":["8.12.3"]},{"ecosystem":"Maven","name":"com.vaadin:vaadin-server","purl":"pkg:maven/com.vaadin/vaadin-server","ranges":[">=7.0.0 <7.7.24"],"fixed":["7.7.24"]},{"ecosystem":"Maven","name":"com.vaadin:vaadin-server","purl":"pkg:maven/com.vaadin/vaadin-server","ranges":[">=8.0.0 <8.12.3"],"fixed":["8.12.3"]}]}],"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."]}