{"id":"CVE-2021-4124","aliases":["DEBIAN-CVE-2021-4124","EUVD-2021-33998","GHSA-gv3q-27qx-g2xh","UBUNTU-CVE-2021-4124"],"status":"published","title":"Cross-site Scripting (XSS) - Stored in meetecho/janus-gateway","description":"janus-gateway is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","severity":{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00969,"percentile":0.62114,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2021-12-16T13:15:11Z","modified":"2026-10-23T18:03:38Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"janus","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.2-1","1.1.2-1.1","1.1.2-1.2","1.1.2-2","1.1.2-3","1.1.2-3.1","1.1.2-4","1.4.1+ds-1","1.4.1+ds-2","1.4.1+ds-3","1.4.1+ds-4"]},{"source":"osv","ecosystem":"Debian:14","package":"janus","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.0-1","0.10.1-1","0.10.2-1","0.10.3-1","0.10.4-1","0.10.5-1","0.10.6-1","0.10.7-1","0.10.8-1","0.10.8-2","0.10.9-1","0.10.9-2","0.11.1-1","0.11.2-1","0.11.3-1~exp1","0.11.4-1","0.11.5-1","0.11.5-2","0.11.5-3","0.11.5-4","0.11.6-1","0.11.6-1~bpo11+1","0.11.7-1","0.11.7-1~bpo11+1","0.11.8-1","0.11.8-1~bpo11+1","0.11.8-2","0.11.8-3","0.11.8-3~bpo11+1","0.12.0-1","0.2.2+dfsg-1","0.2.2+dfsg-2","0.2.2+dfsg-3","0.2.2+dfsg-4","0.2.2+dfsg-5~exp1","0.2.2+dfsg-5~exp2","0.2.2+dfsg-5~exp3","0.2.3-1","0.2.4-1","0.2.4-2","0.2.5-1","0.2.6-1","0.3.1-1","0.4.2-1","0.4.4-1","0.4.5-1","0.4.5-2","0.5.0-1","0.6.0-1","0.6.0-2","0.6.1-1","0.6.2-1","0.6.3-1","0.7.2-1","0.7.2-2","0.7.3-1","0.7.3-2","0.9.1+20200313-1","0.9.1-1","0.9.2-1","0.9.2-1~bpo10+1","0.9.3-1","0.9.4-1","0.9.5-1","1.0.0-1","1.0.0-2","1.0.0-3","1.0.0-4","1.0.0-4~bpo11+1","1.0.1-1","1.0.1-1~bpo11+1","1.0.2-1","1.0.4-1","1.1.0-1","1.1.1-1","1.1.2-1","1.1.2-1.1","1.1.2-1.2","1.1.2-2","1.1.2-3","1.1.2-3.1","1.1.2-4","1.4.1+ds-1","1.4.1+ds-2","1.4.1+ds-3","1.4.1+ds-4"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"janus","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.2.4-2","0.2.5-1","0.2.6-1","0.2.6-1build1","0.2.6-1build2"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"janus","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.7.3-2","0.7.3-2build1"]}],"products":[{"vendor":"meetecho","product":"janus"},{"vendor":"meetecho","product":"meetecho/janus-gateway"}],"references":[{"url":"https://huntr.dev/bounties/a6ca142e-60aa-4d6f-b231-5d1bcd1b7190","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Patch","Third Party Advisory","fix","report"]},{"url":"https://github.com/meetecho/janus-gateway/commit/f62bba6513ec840761f2434b93168106c7c65a3d","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-4124"},{"url":"https://github.com/advisories/GHSA-gv3q-27qx-g2xh"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-4124","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-4124","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-4124","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-4124","title":"Cross-site Scripting (XSS) - 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