{"id":"UBUNTU-CVE-2021-4020","details":"janus-gateway is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","modified":"2025-10-24T04:49:58Z","published":"2021-11-27T10:15:00Z","upstream":["CVE-2021-4020"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-4020"},{"type":"REPORT","url":"https://huntr.dev/bounties/9814baa8-7bdd-4e31-a132-d9d15653409e/"},{"type":"REPORT","url":"https://github.com/meetecho/janus-gateway/commit/ba166e9adebfe5343f826c6a9e02299d35414ffd"},{"type":"REPORT","url":"https://huntr.dev/bounties/9814baa8-7bdd-4e31-a132-d9d15653409e"},{"type":"REPORT","url":"https://github.com/meetecho/janus-gateway/commit/d3fc00ec803d6c41d8f98908732f44e7f4911a1c"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-4020"}],"affected":[{"package":{"name":"janus","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/janus@0.2.6-1build2?arch=source&distro=bionic"},"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"],"ecosystem_specific":{"binaries":[{"binary_name":"janus","binary_version":"0.2.6-1build2"},{"binary_name":"janus-demos","binary_version":"0.2.6-1build2"},{"binary_name":"janus-dev","binary_version":"0.2.6-1build2"},{"binary_name":"janus-tools","binary_version":"0.2.6-1build2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-4020.json"}},{"package":{"name":"janus","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/janus@0.7.3-2build1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.7.3-2","0.7.3-2build1"],"ecosystem_specific":{"binaries":[{"binary_name":"janus","binary_version":"0.7.3-2build1"},{"binary_name":"janus-demos","binary_version":"0.7.3-2build1"},{"binary_name":"janus-dev","binary_version":"0.7.3-2build1"},{"binary_name":"janus-tools","binary_version":"0.7.3-2build1"},{"binary_name":"libjs-janus","binary_version":"0.7.3-2build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-4020.json"}},{"package":{"name":"janus","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/janus@0.11.8-3?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.11.2-1","0.11.5-1","0.11.5-1ubuntu1","0.11.5-3","0.11.5-4","0.11.6-1","0.11.7-1","0.11.8-1","0.11.8-2","0.11.8-3"],"ecosystem_specific":{"binaries":[{"binary_name":"janus","binary_version":"0.11.8-3"},{"binary_name":"janus-demos","binary_version":"0.11.8-3"},{"binary_name":"janus-dev","binary_version":"0.11.8-3"},{"binary_name":"janus-tools","binary_version":"0.11.8-3"},{"binary_name":"libjs-janus","binary_version":"0.11.8-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-4020.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}