{"id":"CVE-2017-0377","url":"https://www.cyber-defence.io/tools/cve/CVE-2017-0377","generatedAt":"2026-10-29T01:42:08.079Z","title":"Tor 0.3.x before 0.3.0.9 has a guard-selection algorithm that only considers the exit relay (not the exit relay's family), which might allow remote attackers to defeat intended anonymity properties by leveraging the existence of large families.","description":"Tor 0.3.x before 0.3.0.9 has a guard-selection algorithm that only considers the exit relay (not the exit relay's family), which might allow remote attackers to defeat intended anonymity properties by leveraging the existence of large families.","published":"2017-07-02T15:29:00.000Z","lastModified":"2026-06-17T00:57:36.000Z","status":"Modified","sourceIdentifier":"security@debian.org","cvss":{"version":"3.0","score":7.5,"severity":"HIGH","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"cwe":["CWE-200"],"affected":["torproject/tor"],"epss":{"score":0.02446,"percentile":0.84258,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (2.45%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://blog.torproject.org/blog/tor-0309-released-security-update-clients","tags":["Release Notes","Vendor Advisory"],"source":"security@debian.org"},{"url":"https://blog.torproject.org/blog/tor-0314-alpha-released-security-update-clients","tags":["Release Notes","Vendor Advisory"],"source":"security@debian.org"},{"url":"https://github.com/torproject/tor/commit/665baf5ed5c6186d973c46cdea165c0548027350","tags":["Patch","Third Party Advisory"],"source":"security@debian.org"},{"url":"https://security-tracker.debian.org/CVE-2017-0377","tags":["Third Party Advisory"],"source":"security@debian.org"},{"url":"https://trac.torproject.org/projects/tor/ticket/22753","tags":["Issue Tracking","Vendor Advisory"],"source":"security@debian.org"},{"url":"https://blog.torproject.org/blog/tor-0309-released-security-update-clients","tags":["Release Notes","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://blog.torproject.org/blog/tor-0314-alpha-released-security-update-clients","tags":["Release Notes","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/torproject/tor/commit/665baf5ed5c6186d973c46cdea165c0548027350","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security-tracker.debian.org/CVE-2017-0377","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://trac.torproject.org/projects/tor/ticket/22753","tags":["Issue Tracking","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2017-0377","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}