{"schemaVersion":3,"id":"USN-2673-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"thunderbird vulnerabilities\n\nKarthikeyan Bhargavan discovered that NSS incorrectly handled state\ntransitions for the TLS state machine. If a remote attacker were able to\nperform a machine-in-the-middle attack, this flaw could be exploited to skip\nthe ServerKeyExchange message and remove the forward-secrecy property.\n(CVE-2015-2721)\n\nBob Clary, Christian Holler, Bobby Holley, and Andrew McCreight discovered\nmultiple memory safety issues in Thunderbird. If a user were tricked in to\nopening a specially crafted website in a browsing context, an attacker\ncould potentially exploit these to cause a denial of service via\napplication crash, or execute arbitrary code with the privileges of the\nuser invoking Thunderbird. (CVE-2015-2724)\n\nRonald Crane discovered multiple security vulnerabilities. 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\nvia application crash, or execute arbitrary code with the privileges of\nthe user invoking Thunderbird. (CVE-2015-2734, CVE-2015-2735,\nCVE-2015-2736, CVE-2015-2737, CVE-2015-2738, CVE-2015-2739, CVE-2015-2740)\n\nMatthew Green discovered a DHE key processing issue in NSS where a MITM\ncould force a server to downgrade TLS connections to 512-bit export-grade\ncryptography. An attacker could potentially exploit this to impersonate\nthe server. (CVE-2015-4000)","dates":{"published":"2015-07-20T22:04:24.000Z","modified":"2026-05-29T18:00:13.461Z","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":"< 1:31.8.0+build1-0ubuntu0.14.04.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:31.8.0+build1-0ubuntu0.14.04.1","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-2673-1","label":"ubuntu.com/security/notices/USN-2673-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2015-2721","label":"ubuntu.com/security/CVE-2015-2721","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2015-2724","label":"ubuntu.com/security/CVE-2015-2724","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2015-2734","label":"ubuntu.com/security/CVE-2015-2734","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2015-2735","label":"ubuntu.com/security/CVE-2015-2735","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2015-2736","label":"ubuntu.com/security/CVE-2015-2736","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2015-2737","label":"ubuntu.com/security/CVE-2015-2737","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2015-2738","label":"ubuntu.com/security/CVE-2015-2738","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2015-2739","label":"ubuntu.com/security/CVE-2015-2739","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2015-2740","label":"ubuntu.com/security/CVE-2015-2740","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2015-4000","label":"ubuntu.com/security/CVE-2015-4000","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2015-2721","CVE-2015-2724","CVE-2015-2734","CVE-2015-2735","CVE-2015-2736","CVE-2015-2737","CVE-2015-2738","CVE-2015-2739","CVE-2015-2740","CVE-2015-4000"],"downstream":[],"duplicates":[],"related":["CVE-2015-2721","CVE-2015-2724","CVE-2015-2730","CVE-2015-2734","CVE-2015-2735","CVE-2015-2736","CVE-2015-2737","CVE-2015-2738","CVE-2015-2739","CVE-2015-2740","CVE-2015-4000"]},"timeline":[{"kind":"published","date":"2015-07-20T22:04:24.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-05-29T18:00:13.461Z","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":"2026-10-19T23:32:04.845Z","stale":false,"partial":false}}