{"schemaVersion":3,"id":"USN-4421-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"thunderbird vulnerabilities\n\nMultiple security issues were discovered in Thunderbird. If a user were\ntricked in to 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 arbtirary code. (CVE-2020-12405,\nCVE-2020-12406, CVE-2020-12410, CVE-2020-12417, CVE-2020-12418,\nCVE-2020-12419, CVE-2020-12420)\n\nIt was discovered that Thunderbird would continue an unencrypted\nconnection when configured to use STARTTLS for IMAP if the server\nresponded with PREAUTH. A remote attacker could potentially exploit\nthis to perform a person-in-the-middle attack in order to obtain\nsensitive information. (CVE-2020-12398)\n\nIt was discovered that NSS showed timing differences when performing DSA\nsignatures. An attacker could potentially exploit this to obtain private\nkeys using a timing attack. (CVE-2020-12399)\n\nIt was discovered that when performing add-on updates, certificate chains\nnot terminating with built-in roots were silently rejected. This could\nresult in add-ons becoming outdated. (CVE-2020-12421)","dates":{"published":"2020-07-08T17:07:07.000Z","modified":"2026-04-22T10:05:57.025Z","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":"< 1:68.10.0+build1-0ubuntu0.16.04.1","noFixRecorded":false,"fixedIn":null},{"text":"< 1:68.10.0+build1-0ubuntu0.18.04.1","noFixRecorded":false,"fixedIn":null},{"text":"< 1:68.10.0+build1-0ubuntu0.20.04.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:68.10.0+build1-0ubuntu0.16.04.1 | < 1:68.10.0+build1-0ubuntu0.18.04.1 | < 1:68.10.0+build1-0ubuntu0.20.04.1","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-4421-1","label":"ubuntu.com/security/notices/USN-4421-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-12398","label":"ubuntu.com/security/CVE-2020-12398","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-12399","label":"ubuntu.com/security/CVE-2020-12399","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-12405","label":"ubuntu.com/security/CVE-2020-12405","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-12406","label":"ubuntu.com/security/CVE-2020-12406","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-12410","label":"ubuntu.com/security/CVE-2020-12410","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-12417","label":"ubuntu.com/security/CVE-2020-12417","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-12418","label":"ubuntu.com/security/CVE-2020-12418","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-12419","label":"ubuntu.com/security/CVE-2020-12419","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-12420","label":"ubuntu.com/security/CVE-2020-12420","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-12421","label":"ubuntu.com/security/CVE-2020-12421","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2020-12398","CVE-2020-12399","CVE-2020-12405","CVE-2020-12406","CVE-2020-12410","CVE-2020-12417","CVE-2020-12418","CVE-2020-12419","CVE-2020-12420","CVE-2020-12421"],"downstream":[],"duplicates":[],"related":["CVE-2020-12398","CVE-2020-12399","CVE-2020-12405","CVE-2020-12406","CVE-2020-12410","CVE-2020-12417","CVE-2020-12418","CVE-2020-12419","CVE-2020-12420","CVE-2020-12421"]},"timeline":[{"kind":"published","date":"2020-07-08T17:07:07.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-22T10:05:57.025Z","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":"2026-10-19T08:59:50.374Z","stale":false,"partial":false}}