{"schemaVersion":3,"id":"USN-6509-1","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 across domains, or execute arbitrary code. (CVE-2023-6206,\nCVE-2023-6210, CVE-2023-6211, CVE-2023-6212, CVE-2023-6213)\n\nIt was discovered that Firefox did not properly manage memory when\nimages were created on the canvas element. An attacker could potentially\nexploit this issue to obtain sensitive information. (CVE-2023-6204)\n\nIt discovered that Firefox incorrectly handled certain memory when using a\nMessagePort. An attacker could potentially exploit this issue to cause a\ndenial of service. (CVE-2023-6205)\n\nIt discovered that Firefox incorrectly did not properly manage ownership\nin ReadableByteStreams. An attacker could potentially exploit this issue\nto cause a denial of service. (CVE-2023-6207)\n\nIt discovered that Firefox incorrectly did not properly manage copy\noperations when using Selection API in X11. An attacker could potentially\nexploit this issue to obtain sensitive information. (CVE-2023-6208)\n\nRachmat Abdul Rokhim discovered that Firefox incorrectly handled parsing\nof relative URLS starting with \"///\". An attacker could potentially\nexploit this issue to cause a denial of service. (CVE-2023-6209)","dates":{"published":"2023-11-23T05:39:06.000Z","modified":"2026-04-22T10:41:32.995Z","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":"< 120.0+build2-0ubuntu0.20.04.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 120.0+build2-0ubuntu0.20.04.1","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-6509-1","label":"ubuntu.com/security/notices/USN-6509-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2023-6204","label":"ubuntu.com/security/CVE-2023-6204","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2023-6205","label":"ubuntu.com/security/CVE-2023-6205","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2023-6206","label":"ubuntu.com/security/CVE-2023-6206","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2023-6207","label":"ubuntu.com/security/CVE-2023-6207","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2023-6208","label":"ubuntu.com/security/CVE-2023-6208","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2023-6209","label":"ubuntu.com/security/CVE-2023-6209","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2023-6210","label":"ubuntu.com/security/CVE-2023-6210","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2023-6211","label":"ubuntu.com/security/CVE-2023-6211","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2023-6212","label":"ubuntu.com/security/CVE-2023-6212","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2023-6213","label":"ubuntu.com/security/CVE-2023-6213","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2023-6204","CVE-2023-6205","CVE-2023-6206","CVE-2023-6207","CVE-2023-6208","CVE-2023-6209","CVE-2023-6210","CVE-2023-6211","CVE-2023-6212","CVE-2023-6213"],"downstream":[],"duplicates":[],"related":["CVE-2023-6204","CVE-2023-6205","CVE-2023-6206","CVE-2023-6207","CVE-2023-6208","CVE-2023-6209","CVE-2023-6210","CVE-2023-6211","CVE-2023-6212","CVE-2023-6213"]},"timeline":[{"kind":"published","date":"2023-11-23T05:39:06.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-22T10:41:32.995Z","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":"2026-10-22T04:29:20.896Z","stale":false,"partial":false}}