{"schemaVersion":3,"id":"USN-4202-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"thunderbird vulnerabilities\n\nIt was discovered that a specially crafted S/MIME message with an inner\nencryption layer could be displayed as having a valid signature in some\ncircumstances, even if the signer had no access to the encrypted message.\nAn attacker could potentially exploit this to spoof the message author.\n(CVE-2019-11755)\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,\nbypass security restrictions, bypass same-origin restrictions, conduct\ncross-site scripting (XSS) attacks, or execute arbitrary code.\n(CVE-2019-11757, CVE-2019-11758, CVE-2019-11759, CVE-2019-11760,\nCVE-2019-11761, CVE-2019-11762, CVE-2019-11763, CVE-2019-11764)\n\nA heap overflow was discovered in the expat library in Thunderbird. If a\nuser were tricked in to opening a specially crafted message, an attacker\ncould potentially exploit this to cause a denial of service, or execute\narbitrary code. (CVE-2019-15903)","dates":{"published":"2019-11-26T23:47:36.000Z","modified":"2026-04-27T15:48:46.099Z","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":"< 1:68.2.1+build1-0ubuntu0.18.04.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:68.2.1+build1-0ubuntu0.18.04.1","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-4202-1","label":"ubuntu.com/security/notices/USN-4202-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2019-11755","label":"ubuntu.com/security/CVE-2019-11755","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2019-11757","label":"ubuntu.com/security/CVE-2019-11757","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2019-11758","label":"ubuntu.com/security/CVE-2019-11758","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2019-11759","label":"ubuntu.com/security/CVE-2019-11759","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2019-11760","label":"ubuntu.com/security/CVE-2019-11760","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2019-11761","label":"ubuntu.com/security/CVE-2019-11761","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2019-11762","label":"ubuntu.com/security/CVE-2019-11762","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2019-11763","label":"ubuntu.com/security/CVE-2019-11763","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2019-11764","label":"ubuntu.com/security/CVE-2019-11764","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2019-15903","label":"ubuntu.com/security/CVE-2019-15903","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2019-11755","CVE-2019-11757","CVE-2019-11759","CVE-2019-11760","CVE-2019-11761","CVE-2019-11762","CVE-2019-11763","CVE-2019-11764","CVE-2019-15903"],"downstream":[],"duplicates":[],"related":["CVE-2019-11755","CVE-2019-11757","CVE-2019-11759","CVE-2019-11760","CVE-2019-11761","CVE-2019-11762","CVE-2019-11763","CVE-2019-11764","CVE-2019-15903"]},"timeline":[{"kind":"published","date":"2019-11-26T23:47:36.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-27T15:48:46.099Z","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":"2026-10-20T10:53:16.575Z","stale":false,"partial":false}}