{"id":"CVE-2021-23384","aliases":["EUVD-2022-1164","GHSA-r773-pmw3-f4mr"],"status":"published","title":"Open Redirect","description":"The package koa-remove-trailing-slashes before 2.0.2 are vulnerable to Open Redirect via the use of trailing double slashes in the URL when accessing the vulnerable endpoint (such as https://example.com//attacker.example/). The vulnerable code is in index.js::removeTrailingSlashes(), as the web server uses relative URLs instead of absolute URLs.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00835,"percentile":0.58,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-601"],"published":"2021-05-17T17:45:12Z","modified":"2026-06-17T03:38:39Z","fixes":[{"ecosystem":"npm","package":"koa-remove-trailing-slashes","fixed_in":["2.0.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"koa-remove-trailing-slashes","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.2"}]}]},{"source":"osv","ecosystem":"npm","package":"koa-remove-trailing-slashes","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.0.2"}]}]}],"products":[{"vendor":"koa-remove-trailing-slashes_project","product":"koa-remove-trailing-slashes"}],"references":[{"url":"https://snyk.io/vuln/SNYK-JS-KOAREMOVETRAILINGSLASHES-1085708","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","web"]},{"url":"https://github.com/vgno/koa-remove-trailing-slashes/blame/6a01ba8fd019bd3ece44879c553037ad96ba7d47/index.js%23L31","tags":["x_refsource_MISC","x_transferred","Broken Link"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-23384","tags":["advisory"]},{"url":"https://github.com/vgno/koa-remove-trailing-slashes/commit/e7ce4000e9fe4d957332df1056640a22ebea28ee","tags":["web"]},{"url":"https://github.com/vgno/koa-remove-trailing-slashes/blame/6a01ba8fd019bd3ece44879c553037ad96ba7d47/index.js#L31","tags":["web"]},{"url":"https://github.com/advisories/GHSA-r773-pmw3-f4mr"},{"url":"https://github.com/vgno/koa-remove-trailing-slashes","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-23384","title":"Open Redirect","description":"The package koa-remove-trailing-slashes before 2.0.2 are vulnerable to Open Redirect via the use of trailing double slashes in the URL when accessing the vulnerable endpoint (such as https://example.com//attacker.example/). The vulnerable code is in index.js::removeTrailingSlashes(), as the web server uses relative URLs instead of absolute URLs.","status":"published","published":"2021-05-17T17:45:12.371Z","modified":"2024-09-16T20:36:40.039Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:33:00.819444Z"}],"euvd":[{"id":"EUVD-2022-1164","description":"The package koa-remove-trailing-slashes before 2.0.2 are vulnerable to Open Redirect via the use of trailing double slashes in the URL when accessing the vulnerable endpoint (such as https://example.com//attacker.example/). The vulnerable code is in index.js::removeTrailingSlashes(), as the web server uses relative URLs instead of absolute URLs.","status":"published","published":"2021-05-17T17:45:12Z","modified":"2024-09-16T20:36:40Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-03T00:55:12.625541Z"}],"ghsa":[{"id":"GHSA-r773-pmw3-f4mr","title":"Open Redirect in koa-remove-trailing-slashes","description":"The package koa-remove-trailing-slashes before 2.0.2 are vulnerable to Open Redirect via the use of trailing double slashes in the URL when accessing the vulnerable endpoint (such as `https://example.com//attacker.example/`). The vulnerable code is in `index.js::removeTrailingSlashes()`, as the web server uses relative URLs instead of absolute URLs.","status":"published","published":"2022-02-10T23:47:27Z","modified":"2023-09-05T23:11:12Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:37:02.632342Z"}],"nvd":[{"id":"CVE-2021-23384","description":"The package koa-remove-trailing-slashes before 2.0.2 are vulnerable to Open Redirect via the use of trailing double slashes in the URL when accessing the vulnerable endpoint (such as https://example.com//attacker.example/). The vulnerable code is in index.js::removeTrailingSlashes(), as the web server uses relative URLs instead of absolute URLs.","status":"published","published":"2021-05-17T18:15:07.733Z","modified":"2026-06-17T03:38:39.843Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:06:53.343329Z"}],"osv":[{"id":"GHSA-r773-pmw3-f4mr","title":"Open Redirect in koa-remove-trailing-slashes","description":"The package koa-remove-trailing-slashes before 2.0.2 are vulnerable to Open Redirect via the use of trailing double slashes in the URL when accessing the vulnerable endpoint (such as `https://example.com//attacker.example/`). The vulnerable code is in `index.js::removeTrailingSlashes()`, as the web server uses relative URLs instead of absolute URLs.","status":"published","published":"2022-02-10T23:47:27Z","modified":"2026-03-13T21:56:59.44821Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T15:46:55.480549Z"}]}}