{"schemaVersion":3,"id":"USN-5036-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"tor vulnerabilities\n\nIt was discovered that Tor incorrectly handled certain memory operations. A\nremote attacker could use this issue to cause a denial of service. This issue\nonly affected Ubuntu 18.04 ESM. (CVE-2019-8955)\n\nIt was discovered that Tor did not properly handle the input length to\ndump_desc() function. A remote attacker could use this issue to cause a denial\nof service. This issue only affected Ubuntu 16.04 ESM, Ubuntu 18.04 ESM and\nUbuntu 20.04 ESM. (CVE-2021-28089)\n\nIt was discovered that Tor did not properly sanitize the relay nickname in\ndirvote_add_signatures_to_pending_consensus() function. An attacker could\npossibly use this issue to cause an assertion failure and then cause a denial\nof service. (CVE-2021-28090)\n\nIt was discovered that Tor did not properly validate the layer hint on\nhalf-open streams. A remote attacker could possibly use this issue to bypass\nthe access control, leading to remote code execution. This issue only affected\nUbuntu 20.04 ESM. (CVE-2021-34548)\n\nIt was discovered that Tor was using an insecure hash function. A remote\nattacker could use this issue to cause a denial of service. This issue only\naffected Ubuntu 16.04 ESM, Ubuntu 18.04 ESM and Ubuntu 20.04 ESM.\n(CVE-2021-34549)\n\nIt was discovered that Tor did not properly manage memory under certain\ncircumstances. If a user were tricked into opening a specially crafted request,\na remote attacker could possibly use this issue to cause a crash, resulting in\na denial of service, or possibly reading sensitive data. This issue only\naffected Ubuntu 18.04 ESM and Ubuntu 20.04 ESM. (CVE-2021-34550)\n\nIt was discovered that Tor mishandles the relationship between batch-signature\nverification and single-signature verification. An attacker could possibly use\nthis issue to cause an assertion failure and then cause a denial of service.\nThis issue only affected Ubuntu 16.04 ESM, Ubuntu 18.04 ESM and Ubuntu 20.04\nESM. (CVE-2021-38385)","dates":{"published":"2022-10-04T11:04:57.000Z","modified":"2026-06-29T13:49:26.448Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":null,"severity":"unknown","version":null,"versionLabel":null,"source":null,"vector":null,"computed":false,"selection":"none"},"metrics":[]},"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":"< 0.2.4.27-1ubuntu0.1+esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 0.2.9.14-1ubuntu1~16.04.3+esm1","noFixRecorded":false,"fixedIn":null},{"text":"< 0.3.2.10-1ubuntu0.2~esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 0.4.2.7-1ubuntu0.1~esm1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.2.4.27-1ubuntu0.1+esm2 | < 0.2.9.14-1ubuntu1~16.04.3+esm1 | < 0.3.2.10-1ubuntu0.2~esm2 | < 0.4.2.7-1ubuntu0.1~esm1","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-5036-1","label":"ubuntu.com/security/notices/USN-5036-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2019-8955","label":"ubuntu.com/security/CVE-2019-8955","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-28089","label":"ubuntu.com/security/CVE-2021-28089","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-28090","label":"ubuntu.com/security/CVE-2021-28090","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-34548","label":"ubuntu.com/security/CVE-2021-34548","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-34549","label":"ubuntu.com/security/CVE-2021-34549","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-34550","label":"ubuntu.com/security/CVE-2021-34550","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-38385","label":"ubuntu.com/security/CVE-2021-38385","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2019-8955","CVE-2021-28089","CVE-2021-28090","CVE-2021-34548","CVE-2021-34549","CVE-2021-34550","CVE-2021-38385"],"downstream":[],"duplicates":[],"related":["CVE-2019-8955","CVE-2021-28089","CVE-2021-28090","CVE-2021-34548","CVE-2021-34549","CVE-2021-34550","CVE-2021-38385"]},"timeline":[{"kind":"published","date":"2022-10-04T11:04:57.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-29T13:49:26.448Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":0,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T16:44:37.591Z","stale":false,"partial":false}}