{"schemaVersion":3,"id":"USN-4637-2","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"firefox vulnerabilities\n\nUSN-4637-1 fixed vulnerabilities in Firefox. This update provides the\ncorresponding updates for Ubuntu 16.04 LTS.\n\nOriginal advisory details:\n\n Multiple security issues were discovered in Firefox. If a user were\n tricked in to opening a specially crafted website, an attacker could\n potentially exploit these to cause a denial of service, obtain sensitive\n information across origins, bypass security restrictions, conduct phishing\n attacks, conduct cross-site scripting (XSS) attacks, bypass Content\n Security Policy (CSP) restrictions, conduct DNS rebinding attacks, or\n execute arbitrary code.","dates":{"published":"2020-11-19T20:12:46.000Z","modified":"2026-04-22T10:10:00.571Z","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":"firefox","name":"firefox","label":"firefox","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/firefox","purlType":"deb","versions":[{"text":"< 83.0+build2-0ubuntu0.16.04.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 83.0+build2-0ubuntu0.16.04.3","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-4637-2","label":"ubuntu.com/security/notices/USN-4637-2","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-16012","label":"ubuntu.com/security/CVE-2020-16012","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-26951","label":"ubuntu.com/security/CVE-2020-26951","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-26952","label":"ubuntu.com/security/CVE-2020-26952","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-26953","label":"ubuntu.com/security/CVE-2020-26953","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-26956","label":"ubuntu.com/security/CVE-2020-26956","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-26958","label":"ubuntu.com/security/CVE-2020-26958","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-26959","label":"ubuntu.com/security/CVE-2020-26959","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-26960","label":"ubuntu.com/security/CVE-2020-26960","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-26961","label":"ubuntu.com/security/CVE-2020-26961","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-26962","label":"ubuntu.com/security/CVE-2020-26962","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-26963","label":"ubuntu.com/security/CVE-2020-26963","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-26965","label":"ubuntu.com/security/CVE-2020-26965","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-26967","label":"ubuntu.com/security/CVE-2020-26967","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-26968","label":"ubuntu.com/security/CVE-2020-26968","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-26969","label":"ubuntu.com/security/CVE-2020-26969","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2020-16012","CVE-2020-26951","CVE-2020-26952","CVE-2020-26953","CVE-2020-26956","CVE-2020-26958","CVE-2020-26959","CVE-2020-26960","CVE-2020-26961","CVE-2020-26962","CVE-2020-26963","CVE-2020-26965","CVE-2020-26967","CVE-2020-26968","CVE-2020-26969"],"downstream":[],"duplicates":[],"related":["CVE-2020-16012","CVE-2020-26951","CVE-2020-26952","CVE-2020-26953","CVE-2020-26956","CVE-2020-26958","CVE-2020-26959","CVE-2020-26960","CVE-2020-26961","CVE-2020-26962","CVE-2020-26963","CVE-2020-26965","CVE-2020-26967","CVE-2020-26968","CVE-2020-26969"]},"timeline":[{"kind":"published","date":"2020-11-19T20:12:46.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-22T10:10:00.571Z","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":"2026-10-19T17:46:49.319Z","stale":false,"partial":false}}