{"schemaVersion":3,"id":"USN-4936-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"thunderbird vulnerabilities\n\nMultiple security issues were discovered in Thunderbird. If a user were\ntricked into opening a specially crafted website in a browsing context,\nan attacker could potentially exploit these to cause a denial of service,\nobtain sensitive information, or execute arbitrary code. (CVE-2021-23968,\nCVE-2021-23969, CVE-2021-23973, CVE-2021-23978)\n\nIt was discovered that Thunderbird may keep key material in memory in some\ncircumstances. A local attacker could potentially exploit this to obtain\nprivate keys. (CVE-2021-29950)","dates":{"published":"2021-05-06T13:13:01.000Z","modified":"2026-04-22T10:14:23.766Z","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":"thunderbird","name":"thunderbird","label":"thunderbird","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/thunderbird","purlType":"deb","versions":[{"text":"< 1:78.8.1+build1-0ubuntu0.20.04.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:78.8.1+build1-0ubuntu0.20.04.1","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-4936-1","label":"ubuntu.com/security/notices/USN-4936-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-23968","label":"ubuntu.com/security/CVE-2021-23968","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-23969","label":"ubuntu.com/security/CVE-2021-23969","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-23973","label":"ubuntu.com/security/CVE-2021-23973","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-23978","label":"ubuntu.com/security/CVE-2021-23978","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-29950","label":"ubuntu.com/security/CVE-2021-29950","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2021-23968","CVE-2021-23969","CVE-2021-23973","CVE-2021-23978","CVE-2021-29950"],"downstream":[],"duplicates":[],"related":["CVE-2021-23968","CVE-2021-23969","CVE-2021-23973","CVE-2021-23978","CVE-2021-29950"]},"timeline":[{"kind":"published","date":"2021-05-06T13:13:01.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-22T10:14:23.766Z","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":"2026-10-21T01:14:19.972Z","stale":false,"partial":false}}