{"id":"CVE-2021-22963","aliases":["GHSA-p6vg-p826-qp3v"],"url":"https://o3.security/vulnerability/CVE-2021-22963","summary":"URL Redirection to Untrusted Site ('Open Redirect') in fastify-static","details":"A redirect vulnerability in the fastify-static module version < 4.2.4 allows remote attackers to redirect users to arbitrary websites via a double slash // followed by a domain: http://localhost:3000//google.com/%2e%2e.The issue shows up on all the fastify-static applications that set redirect: true option. By default, it is false.","published":"2021-10-14T15:15:08.877Z","modified":"2026-07-09T01:07:27.752381Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":{"score":0.01169,"percentile":0.64531,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"npm","name":"fastify-static","fixedVersion":"4.2.4"}],"fix":null,"references":[{"type":"REPORT","url":"https://hackerone.com/reports/1354255"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T01:07:27.752381Z"}}