{"cve":"CVE-2020-35217","nvd":{"published":"2021-01-20T13:15:12.440","modified":"2026-06-17T03:13:33.010","status":"Modified","description":"Vert.x-Web framework v4.0 milestone 1-4 does not perform a correct CSRF verification. Instead of comparing the CSRF token in the request with the CSRF token in the cookie, it compares the CSRF token in the cookie against a CSRF token that is stored in the session. An attacker does not even need to provide a CSRF token in the request because the framework does not consider it. The cookies are automatically sent by the browser and the verification will always succeed, leading to a successful CSRF attack.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-352"],"references":["https://github.com/vert-x3/vertx-web/pull/1613","https://github.com/vert-x3/vertx-web/pull/1613"],"products":["eclipse:vert.x-web"],"source":"nvd","synced_at":"2026-10-19T21:14:10.479542811+00:00"},"epss":{"cve":"CVE-2020-35217","score":0.00587,"percentile":0.48071,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-9q69-g5gc-9fgf","url":"https://osv.dev/vulnerability/GHSA-9q69-g5gc-9fgf","summary":"Cross-Site Request Forgery in Vert.x-Web framework","modified":"2023-11-08T04:03:33.135481Z","packages":[{"ecosystem":"Maven","name":"io.vertx:vertx-web","purl":"pkg:maven/io.vertx/vertx-web","ranges":[">=4.0.0-milestone1 <4.0.0-milestone5"],"fixed":["4.0.0-milestone5"]},{"ecosystem":"Maven","name":"io.vertx:vertx-web","purl":"pkg:maven/io.vertx/vertx-web","ranges":[">=4.0.0-milestone2 <4.0.0-milestone5"],"fixed":["4.0.0-milestone5"]},{"ecosystem":"Maven","name":"io.vertx:vertx-web","purl":"pkg:maven/io.vertx/vertx-web","ranges":[">=4.0.0-milestone3 <4.0.0-milestone5"],"fixed":["4.0.0-milestone5"]},{"ecosystem":"Maven","name":"io.vertx:vertx-web","purl":"pkg:maven/io.vertx/vertx-web","ranges":[">=4.0.0-milestone4 <4.0.0-milestone5"],"fixed":["4.0.0-milestone5"]}]}],"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."]}