{"api_version":"1","generated_at":"2026-07-23T14:15:24+00:00","cve":"CVE-2021-23384","urls":{"html":"https://cve.report/CVE-2021-23384","api":"https://cve.report/api/cve/CVE-2021-23384.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-23384","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-23384"},"summary":{"title":"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.","state":"PUBLIC","assigner":"report@snyk.io","published_at":"2021-05-17 18:15:00","updated_at":"2021-05-25 14:39:00"},"problem_types":["CWE-601"],"metrics":[],"references":[{"url":"https://snyk.io/vuln/SNYK-JS-KOAREMOVETRAILINGSLASHES-1085708","name":"https://snyk.io/vuln/SNYK-JS-KOAREMOVETRAILINGSLASHES-1085708","refsource":"MISC","tags":[],"title":"Open Redirect in koa-remove-trailing-slashes | Snyk","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/vgno/koa-remove-trailing-slashes/blame/6a01ba8fd019bd3ece44879c553037ad96ba7d47/index.js%23L31","name":"https://github.com/vgno/koa-remove-trailing-slashes/blame/6a01ba8fd019bd3ece44879c553037ad96ba7d47/index.js%23L31","refsource":"MISC","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":""},{"url":"https://github.com/vgno/koa-remove-trailing-slashes/blame/6a01ba8fd019bd3ece44879c553037ad96ba7d47/index.js#L31","name":"MISC:https://github.com/vgno/koa-remove-trailing-slashes/blame/6a01ba8fd019bd3ece44879c553037ad96ba7d47/index.js%23L31","refsource":"MITRE","tags":[],"title":"koa-remove-trailing-slashes/index.js at 6a01ba8fd019bd3ece44879c553037ad96ba7d47 · vgno/koa-remove-trailing-slashes · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-23384","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-23384","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"LEGACY","value":"apple502j","lang":""}],"nvd_cpes":[{"cve_year":"2021","cve_id":"23384","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"koa-remove-trailing-slashes_project","cpe5":"koa-remove-trailing-slashes","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"node.js","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"data_type":"CVE","data_format":"MITRE","data_version":"4.0","CVE_data_meta":{"ASSIGNER":"report@snyk.io","DATE_PUBLIC":"2021-05-17T17:43:04.055580Z","ID":"CVE-2021-23384","STATE":"PUBLIC","TITLE":"Open Redirect"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"koa-remove-trailing-slashes","version":{"version_data":[{"version_affected":"<","version_value":"2.0.2"}]}}]},"vendor_name":"n/a"}]}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"Open Redirect"}]}]},"references":{"reference_data":[{"refsource":"MISC","url":"https://snyk.io/vuln/SNYK-JS-KOAREMOVETRAILINGSLASHES-1085708","name":"https://snyk.io/vuln/SNYK-JS-KOAREMOVETRAILINGSLASHES-1085708"},{"refsource":"MISC","url":"https://github.com/vgno/koa-remove-trailing-slashes/blame/6a01ba8fd019bd3ece44879c553037ad96ba7d47/index.js%23L31","name":"https://github.com/vgno/koa-remove-trailing-slashes/blame/6a01ba8fd019bd3ece44879c553037ad96ba7d47/index.js%23L31"}]},"description":{"description_data":[{"lang":"eng","value":"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."}]},"impact":{"cvss":{"version":"3.1","vectorString":"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","baseScore":5.4,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE"}},"credit":[{"lang":"eng","value":"apple502j"}]},"nvd":{"publishedDate":"2021-05-17 18:15:00","lastModifiedDate":"2021-05-25 14:39:00","problem_types":["CWE-601"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM"},"exploitabilityScore":2.8,"impactScore":2.5},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:P/I:P/A:N","accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"NONE","baseScore":5.8},"severity":"MEDIUM","exploitabilityScore":8.6,"impactScore":4.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":true}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:koa-remove-trailing-slashes_project:koa-remove-trailing-slashes:*:*:*:*:*:node.js:*:*","versionEndExcluding":"2.0.2","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"23384","Ordinal":"198111","Title":"CVE-2021-23384","CVE":"CVE-2021-23384","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"23384","Ordinal":"1","NoteData":"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.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"23384","Ordinal":"2","NoteData":"2021-05-17","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"23384","Ordinal":"3","NoteData":"2021-05-17","Type":"Other","Title":"Modified"}]}}}