{"schemaVersion":3,"id":"USN-4893-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"firefox vulnerabilities\n\nMultiple security issues were discovered in Firefox. If a user were\ntricked into opening a specially crafted website, an attacker could\npotentially exploit these to cause a denial of service, obtain sensitive\ninformation, or execute arbitrary code. (CVE-2021-23981, CVE-2021-23982,\nCVE-2021-23983, CVE-2021-23987, CVE-2021-23988)\n\nIt was discovered that extensions could open popup windows with control\nof the window title in some circumstances. If a user were tricked into\ninstalling a specially crafted extension, an attacker could potentially\nexploit this to spook a website and trick the user into providing\ncredentials. (CVE-2021-23984)\n\nIt was discovered that the DevTools remote debugging feature could be\nenabled without an indication to the user. If a local attacker could\nmodify the browser configuration, a remote attacker could potentially\nexploit this to obtain sensitive information. (CVE-2021-23985)\n\nIt was discovered that extensions could read the response of cross\norigin requests in some circumstances. If a user were tricked into\ninstalling a specially crafted extension, an attacker could potentially\nexploit this to obtain sensitive information. (CVE-2021-23986)","dates":{"published":"2021-03-25T22:36:31.000Z","modified":"2026-04-22T10:13:16.804Z","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":"< 87.0+build3-0ubuntu0.16.04.2","noFixRecorded":false,"fixedIn":null},{"text":"< 87.0+build3-0ubuntu0.18.04.2","noFixRecorded":false,"fixedIn":null},{"text":"< 87.0+build3-0ubuntu0.20.04.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 87.0+build3-0ubuntu0.16.04.2 | < 87.0+build3-0ubuntu0.18.04.2 | < 87.0+build3-0ubuntu0.20.04.2","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-4893-1","label":"ubuntu.com/security/notices/USN-4893-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-23981","label":"ubuntu.com/security/CVE-2021-23981","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-23982","label":"ubuntu.com/security/CVE-2021-23982","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-23983","label":"ubuntu.com/security/CVE-2021-23983","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-23984","label":"ubuntu.com/security/CVE-2021-23984","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-23985","label":"ubuntu.com/security/CVE-2021-23985","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-23986","label":"ubuntu.com/security/CVE-2021-23986","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-23987","label":"ubuntu.com/security/CVE-2021-23987","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-23988","label":"ubuntu.com/security/CVE-2021-23988","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2021-23981","CVE-2021-23982","CVE-2021-23983","CVE-2021-23984","CVE-2021-23985","CVE-2021-23986","CVE-2021-23987","CVE-2021-23988"],"downstream":[],"duplicates":[],"related":["CVE-2021-23981","CVE-2021-23982","CVE-2021-23983","CVE-2021-23984","CVE-2021-23985","CVE-2021-23986","CVE-2021-23987","CVE-2021-23988"]},"timeline":[{"kind":"published","date":"2021-03-25T22:36:31.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-22T10:13:16.804Z","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":"2026-10-20T17:20:01.827Z","stale":false,"partial":false}}