{"schemaVersion":3,"id":"UBUNTU-CVE-2020-8516","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"** DISPUTED ** The daemon in Tor through 0.4.1.8 and 0.4.2.x through 0.4.2.6 does not verify that a rendezvous node is known before attempting to connect to it, which might make it easier for remote attackers to discover circuit information. NOTE: The network team of Tor claims this is an intended behavior and not a vulnerability.","dates":{"published":"2020-02-02T13:15:00.000Z","modified":"2020-02-02T13:15:00.000Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.3,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","computed":true,"selection":"version-preference"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","exploitability":10,"impact":2.3,"computed":true}]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[],"affected":[{"vendor":"ubuntu","product":"tor","name":"tor","label":"tor","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/tor","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/CVE-2020-8516","label":"ubuntu.com/security/CVE-2020-8516","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html","label":"www.hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html","hostname":"www.hackerfactor.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-8516","label":"www.cve.org/CVERecord?id=CVE-2020-8516","hostname":"www.cve.org","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2020-02-02T13:15:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null}],"risk":{"score":21,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T21:10:46.134Z","stale":false,"partial":false}}