{"id":"UBUNTU-CVE-2021-36377","details":"Fossil before 2.14.2 and 2.15.x before 2.15.2 often skips the hostname check during TLS certificate validation.","modified":"2026-05-20T16:05:05.284648505Z","published":"2021-07-12T13:15:00Z","upstream":["CVE-2021-36377"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-36377"},{"type":"REPORT","url":"https://fossil-scm.org/forum/forumpost/8d367e16f53d93c789d70bd3bf2c9587227bbd5c6a7b8e512cccd79007536036"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-36377"}],"affected":[{"package":{"name":"fossil","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/fossil?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.33-3","1:1.33-3ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1:1.33-3ubuntu0.1~esm1","binary_name":"fossil"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-36377.json"}},{"package":{"name":"fossil","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/fossil?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:2.2-1","1:2.4-1","1:2.4-1build1","1:2.5-1","1:2.5-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"fossil","binary_version":"1:2.5-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-36377.json"}},{"package":{"name":"fossil","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/fossil?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:2.8-1","1:2.10-1","1:2.10-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"fossil","binary_version":"1:2.10-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-36377.json"}},{"package":{"name":"fossil","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/fossil?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:2.15.2-1","1:2.16-3","1:2.16-3build1","1:2.17-1","1:2.17-2","1:2.18-1","1:2.18-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"fossil","binary_version":"1:2.18-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-36377.json"}},{"package":{"name":"fossil","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/fossil?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:2.22-1","1:2.22-2","1:2.23-1","1:2.23-1build1","1:2.23-1build2","1:2.23-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"fossil","binary_version":"1:2.23-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-36377.json"}},{"package":{"name":"fossil","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/fossil?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:2.24-6","1:2.26-1","1:2.26-2"],"ecosystem_specific":{"binaries":[{"binary_name":"fossil","binary_version":"1:2.26-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-36377.json"}},{"package":{"name":"fossil","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/fossil?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:2.26-2"],"ecosystem_specific":{"binaries":[{"binary_name":"fossil","binary_version":"1:2.26-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-36377.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}