{"schemaVersion":3,"id":"CVE-2017-8821","aliases":["UBUNTU-CVE-2017-8821","DEBIAN-CVE-2017-8821"],"status":"published","duplicateOf":null,"title":null,"description":"In Tor before 0.2.5.16, 0.2.6 through 0.2.8 before 0.2.8.17, 0.2.9 before 0.2.9.14, 0.3.0 before 0.3.0.13, and 0.3.1 before 0.3.1.9, an attacker can cause a denial of service (application hang) via crafted PEM input that signifies a public key requiring a password, which triggers an attempt by the OpenSSL library to ask the user for the password, aka TROVE-2017-011.","dates":{"published":"2017-12-03T07:00:00.000Z","modified":"2024-08-05T16:48:22.407Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.0","versionLabel":"v3.0","source":"NVD","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.0","versionLabel":"v3.0","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":5,"severity":"medium","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","exploitability":null,"impact":null,"computed":false},{"version":"3.0","versionLabel":"v3.0","source":"OSV · Ubuntu","score":7.5,"severity":"high","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.0","versionLabel":"v3.0","source":"OSV · Debian","score":7.5,"severity":"high","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true}]},"epss":{"probability":0.01956,"percentile":0.80001,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.01956},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01856,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01956,"percentile":0.80001}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01856,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01956,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01956,"percentile":0.80001}]},"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":[{"id":"CWE-119","name":"Improper Restriction of Operations within the Bounds of a Memory Buffer","description":"The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.","type":"weakness","status":"Stable","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/119.html"}],"affected":[{"vendor":"debian","product":"tor","name":"tor","label":"tor","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/tor","purlType":"deb","versions":[{"text":"< 0.3.1.9-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.3.1.9-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"tor","name":"tor","label":"tor","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/tor","purlType":"deb","versions":[{"text":"< 0.2.4.27-1ubuntu0.1","noFixRecorded":false,"fixedIn":null},{"text":"< 0.2.9.14-1ubuntu1~16.04.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.2.4.27-1ubuntu0.1 | < 0.2.9.14-1ubuntu1~16.04.2","eol":null,"hubHref":null},{"vendor":"debian","product":"debian_linux","name":"debian linux","label":"debian_linux","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"8.0","noFixRecorded":false,"fixedIn":null},{"text":"9.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"8.0 | 9.0","eol":{"isEol":true,"eolDate":"2020-06-30T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"8","label":"8 (Jessie)","eolFrom":"2020-06-30T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":"8.11"},"product":{"name":"debian","label":"Debian","category":"os"}},"hubHref":"/vendor/debian/debian_linux"},{"vendor":"tor_project","product":"tor","name":"tor","label":"tor","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 0.2.5.16","noFixRecorded":false,"fixedIn":null},{"text":"≥ 0.2.6, < 0.2.8.17","noFixRecorded":false,"fixedIn":null},{"text":"≥ 0.2.9, < 0.2.9.14","noFixRecorded":false,"fixedIn":null},{"text":"≥ 0.3.0, < 0.3.0.13","noFixRecorded":false,"fixedIn":null},{"text":"≥ 0.3.1, < 0.3.1.9","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.2.5.16 | ≥ 0.2.6, < 0.2.8.17 | ≥ 0.2.9, < 0.2.9.14 | ≥ 0.3.0, < 0.3.0.13 | ≥ 0.3.1, < 0.3.1.9","eol":null,"hubHref":"/vendor/tor_project/tor"}],"affectedCount":4,"eol":{"hasEol":true,"count":1},"references":[{"url":"https://blog.torproject.org/new-stable-tor-releases-security-fixes-0319-03013-02914-02817-02516","label":"blog.torproject.org/new-stable-tor-releases-security-fixes-0319-03013-02914-02817-02516","hostname":"blog.torproject.org","tags":["X Refsource CONFIRM","Vendor Advisory","REPORT"]},{"url":"https://www.debian.org/security/2017/dsa-4054","label":"www.debian.org/security/2017/dsa-4054","hostname":"www.debian.org","tags":["Vendor Advisory","X Refsource DEBIAN","Third Party Advisory"]},{"url":"https://bugs.torproject.org/24246","label":"bugs.torproject.org/24246","hostname":"bugs.torproject.org","tags":["X Refsource CONFIRM","Vendor Advisory","REPORT"]},{"url":"https://ubuntu.com/security/CVE-2017-8821","label":"ubuntu.com/security/CVE-2017-8821","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2017-8821","label":"www.cve.org/CVERecord?id=CVE-2017-8821","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2017-8821","label":"security-tracker.debian.org/tracker/CVE-2017-8821","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["DSA-4054-1","MGASA-2017-0444","OPENSUSE-SU-2017:3201-1","OPENSUSE-SU-2017:3203-1","OPENSUSE-SU-2024:11469-1"],"duplicates":[],"related":["OPENSUSE-SU-2017:3201-1","OPENSUSE-SU-2017:3203-1","OPENSUSE-SU-2024:11469-1"]},"timeline":[{"kind":"published","date":"2017-12-03T07:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-05T16:48:22.407Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T22:38:08.392Z","stale":false,"partial":false}}