{"id":"UBUNTU-CVE-2021-28089","details":"Tor before 0.4.5.7 allows a remote participant in the Tor directory protocol to exhaust CPU resources on a target, aka TROVE-2021-001.","modified":"2026-01-30T01:08:42.067721Z","published":"2021-03-19T05:15:00Z","related":["USN-5036-1"],"upstream":["CVE-2021-28089"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-28089"},{"type":"REPORT","url":"https://blog.torproject.org/node/2009"},{"type":"REPORT","url":"https://bugs.torproject.org/tpo/core/tor/40286"},{"type":"REPORT","url":"https://gitlab.torproject.org/tpo/core/tor/-/commit/ede88c374cd61e1e362422718625707a770cffff"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5036-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-28089"}],"affected":[{"package":{"name":"tor","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/tor@0.2.9.14-1ubuntu1~16.04.3+esm1?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.2.9.14-1ubuntu1~16.04.3+esm1"}]}],"versions":["0.2.6.10-1ubuntu2","0.2.7.6-1ubuntu1","0.2.9.11-1ubuntu1~16.04.1","0.2.9.14-1ubuntu1~16.04.1","0.2.9.14-1ubuntu1~16.04.2","0.2.9.14-1ubuntu1~16.04.3"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"tor","binary_version":"0.2.9.14-1ubuntu1~16.04.3+esm1"},{"binary_name":"tor-geoipdb","binary_version":"0.2.9.14-1ubuntu1~16.04.3+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28089.json"}},{"package":{"name":"tor","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/tor@0.3.2.10-1ubuntu0.2~esm2?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.3.2.10-1ubuntu0.2~esm2"}]}],"versions":["0.3.0.10-1","0.3.1.8-2","0.3.1.9-1","0.3.2.9-1","0.3.2.9-1build1","0.3.2.10-1","0.3.2.10-1ubuntu0.1","0.3.2.10-1ubuntu0.2~esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"tor","binary_version":"0.3.2.10-1ubuntu0.2~esm2"},{"binary_name":"tor-geoipdb","binary_version":"0.3.2.10-1ubuntu0.2~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28089.json"}},{"package":{"name":"tor","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/tor@0.4.2.7-1ubuntu0.1~esm1?arch=source&distro=esm-apps/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.2.7-1ubuntu0.1~esm1"}]}],"versions":["0.4.1.5-1","0.4.1.5-1build1","0.4.1.6-1","0.4.2.5-1","0.4.2.6-1","0.4.2.7-1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"tor","binary_version":"0.4.2.7-1ubuntu0.1~esm1"},{"binary_name":"tor-geoipdb","binary_version":"0.4.2.7-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28089.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}