{"id":"UBUNTU-CVE-2015-2689","details":"Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets.","modified":"2025-09-08T16:43:21Z","published":"2020-01-24T18:15:00Z","upstream":["CVE-2015-2689"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2015-2689"},{"type":"REPORT","url":"https://bugs.torproject.org/14129"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2015-2689"}],"affected":[{"package":{"name":"tor","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/tor@0.2.4.27-1build0.14.04.1?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.2.4.27-1build0.14.04.1"}]}],"versions":["0.2.3.25-1","0.2.4.19-1","0.2.4.20-1"],"ecosystem_specific":{"binaries":[{"binary_name":"tor","binary_version":"0.2.4.27-1build0.14.04.1"},{"binary_name":"tor-geoipdb","binary_version":"0.2.4.27-1build0.14.04.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2015/UBUNTU-CVE-2015-2689.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":"low"}]}