{"id":"CVE-2021-27516","aliases":["GHSA-p6j9-7xhc-rhwp"],"url":"https://o3.security/vulnerability/CVE-2021-27516","summary":"URIjs Hostname spoofing via backslashes in URL","details":"URI.js (aka urijs) before 1.19.6 mishandles certain uses of backslash such as http:\\/ and interprets the URI as a relative path.","published":"2021-02-22T00:15:12.620Z","modified":"2026-07-09T01:06:32.287582Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"npm","name":"urijs","fixedVersion":"1.19.6"}],"fix":{"url":"https://github.com/medialize/URI.js/commit/a1ad8bcbc39a4d136d7e252e76e957f3ece70839","label":"medialize/URI.js@a1ad8bc"},"references":[{"type":"ADVISORY","url":"https://github.com/medialize/URI.js/releases/tag/v1.19.6"},{"type":"FIX","url":"https://github.com/medialize/URI.js/commit/a1ad8bcbc39a4d136d7e252e76e957f3ece70839"},{"type":"EVIDENCE","url":"https://advisory.checkmarx.net/advisory/CX-2021-4305"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T01:06:32.287582Z"}}