{"cve":"CVE-2021-27516","nvd":{"published":"2021-02-22T00:15:12.620","modified":"2026-06-17T03:45:00.637","status":"Modified","description":"URI.js (aka urijs) before 1.19.6 mishandles certain uses of backslash such as http:\\/ and interprets the URI as a relative path.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":[],"references":["https://advisory.checkmarx.net/advisory/CX-2021-4305","https://github.com/medialize/URI.js/commit/a1ad8bcbc39a4d136d7e252e76e957f3ece70839","https://github.com/medialize/URI.js/releases/tag/v1.19.6","https://advisory.checkmarx.net/advisory/CX-2021-4305","https://github.com/medialize/URI.js/commit/a1ad8bcbc39a4d136d7e252e76e957f3ece70839"],"products":["uri.js_project:uri.js"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2021-27516","score":0.02483,"percentile":0.84598,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-p6j9-7xhc-rhwp","url":"https://osv.dev/vulnerability/GHSA-p6j9-7xhc-rhwp","summary":"URIjs Hostname spoofing via backslashes in URL","modified":"2023-11-08T04:05:24.794143Z","packages":[{"ecosystem":"npm","name":"urijs","purl":"pkg:npm/urijs","ranges":["<1.19.6"],"fixed":["1.19.6"]}]}],"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."]}