{"id":"CVE-2021-32721","aliases":["EUVD-2021-1482","GHSA-mj9r-wwm8-7q52","GO-2021-0237"],"status":"published","title":"URL Redirection to Untrusted Site ('Open Redirect') in github.com/AndrewBurian/powermux","description":"PowerMux is a drop-in replacement for Go's http.ServeMux. In PowerMux versions prior to 1.1.1, attackers may be able to craft phishing links and other open redirects by exploiting the trailing slash redirection feature. This may lead to users being redirected to untrusted sites after following an attacker crafted link. The issue is resolved in v1.1.1. There are no existing workarounds.","severity":{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00606,"percentile":0.49441,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-601"],"published":"2021-06-29T18:40:10Z","modified":"2026-10-20T10:54:43Z","fixes":[{"ecosystem":"Go","package":"github.com/AndrewBurian/powermux","fixed_in":["1.1.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/AndrewBurian/powermux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.1"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/AndrewBurian/powermux","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.1.1"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/AndrewBurian/powermux","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.1.1"}]}]}],"products":[{"vendor":"andrewburian","product":"powermux"},{"vendor":"powermux_project","product":"powermux"}],"references":[{"url":"https://github.com/AndrewBurian/powermux/security/advisories/GHSA-mj9r-wwm8-7q52","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-32721","tags":["advisory"]},{"url":"https://github.com/AndrewBurian/powermux/commit/5e60a8a0372b35a898796c2697c40e8daabed8e9","tags":["web","fix"]},{"url":"https://github.com/AndrewBurian/powermux/pull/42","tags":["web","fix"]},{"url":"https://github.com/advisories/GHSA-mj9r-wwm8-7q52"}],"sources":{"cve":[{"id":"CVE-2021-32721","title":"URL Redirection to Untrusted Site ('Open Redirect') in github.com/AndrewBurian/powermux","description":"PowerMux is a drop-in replacement for Go's http.ServeMux. In PowerMux versions prior to 1.1.1, attackers may be able to craft phishing links and other open redirects by exploiting the trailing slash redirection feature. This may lead to users being redirected to untrusted sites after following an attacker crafted link. The issue is resolved in v1.1.1. There are no existing workarounds.","status":"published","published":"2021-06-29T18:40:10Z","modified":"2024-08-03T23:25:31.079Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:33:07.014772Z"}],"euvd":[{"id":"EUVD-2021-1482","description":"PowerMux is a drop-in replacement for Go's http.ServeMux. In PowerMux versions prior to 1.1.1, attackers may be able to craft phishing links and other open redirects by exploiting the trailing slash redirection feature. This may lead to users being redirected to untrusted sites after following an attacker crafted link. The issue is resolved in v1.1.1. There are no existing workarounds.","status":"published","published":"2021-06-29T18:40:10Z","modified":"2024-08-03T23:25:31Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-03T03:24:36.41075Z"}],"ghsa":[{"id":"GHSA-mj9r-wwm8-7q52","title":"Open Redirect in github.com/AndrewBurian/powermux","description":"### Impact\nAttackers may be able to craft phishing links and other open redirects by exploiting the trailing slash redirection feature. This may lead to users being redirected to untrusted sites after following an attacker crafted link.\n\n### Patches\nThe issue is resolved in v1.1.1\n\n### Workarounds\nThere are no existing workarounds.\nYou may detect attempts to craft urls that exploit this feature by looking for request paths containing pairs of forward slashes in sequence combined with a trailing slash e.g. `https://example.com//foo/`\n","status":"published","published":"2021-07-01T17:00:32Z","modified":"2024-05-30T05:04:30Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:37:52.2286Z"}],"nvd":[{"id":"CVE-2021-32721","description":"PowerMux is a drop-in replacement for Go's http.ServeMux. In PowerMux versions prior to 1.1.1, attackers may be able to craft phishing links and other open redirects by exploiting the trailing slash redirection feature. This may lead to users being redirected to untrusted sites after following an attacker crafted link. The issue is resolved in v1.1.1. There are no existing workarounds.","status":"published","published":"2021-06-29T19:15:09.707Z","modified":"2026-06-17T03:53:29.883Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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":"2026-11-02T14:06:55.259633Z"}],"osv":[{"id":"CVE-2021-32721","description":"PowerMux is a drop-in replacement for Go's http.ServeMux. In PowerMux versions prior to 1.1.1, attackers may be able to craft phishing links and other open redirects by exploiting the trailing slash redirection feature. This may lead to users being redirected to untrusted sites after following an attacker crafted link. The issue is resolved in v1.1.1. There are no existing workarounds.","status":"published","published":"2021-06-29T19:15:09.707Z","modified":"2026-10-20T10:54:43.122849166Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:19.793849Z"},{"id":"GHSA-mj9r-wwm8-7q52","title":"Open Redirect in github.com/AndrewBurian/powermux","description":"### Impact\nAttackers may be able to craft phishing links and other open redirects by exploiting the trailing slash redirection feature. This may lead to users being redirected to untrusted sites after following an attacker crafted link.\n\n### Patches\nThe issue is resolved in v1.1.1\n\n### Workarounds\nThere are no existing workarounds.\nYou may detect attempts to craft urls that exploit this feature by looking for request paths containing pairs of forward slashes in sequence combined with a trailing slash e.g. `https://example.com//foo/`\n","status":"published","published":"2021-07-01T17:00:32Z","modified":"2026-07-08T06:28:52.800795149Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T15:46:51.811331Z"},{"id":"GO-2021-0237","title":"Open redirect in github.com/AndrewBurian/powermux","description":"Attackers may be able to craft phishing links and other open redirects by exploiting PowerMux's trailing slash redirection feature. This may lead to users being redirected to untrusted sites after following an attacker crafted link.","status":"published","published":"2022-01-11T17:18:11Z","modified":"2024-05-20T16:03:47Z","updated_at":"2026-11-02T15:47:00.604718Z"}]}}