{"schemaVersion":3,"id":"USN-6407-2","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"libx11 vulnerabilities\n\nUSN-6407-1 fixed several vulnerabilities in libx11. This update provides\nthe corresponding update for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.\n\nOriginal advisory details:\n\n Gregory James Duck discovered that libx11 incorrectly handled certain\n keyboard symbols. If a user were tricked into connecting to a malicious X\n server, a remote attacker could use this issue to cause libx11 to crash,\n resulting in a denial of service, or possibly execute arbitrary code.\n (CVE-2023-43785)\n\n Yair Mizrahi discovered that libx11 incorrectly handled certain malformed\n XPM image files. If a user were tricked into opening a specially crafted\n XPM image file, a remote attacker could possibly use this issue to consume\n memory, leading to a denial of service. (CVE-2023-43786)\n\n Yair Mizrahi discovered that libx11 incorrectly handled certain malformed\n XPM image files. If a user were tricked into opening a specially crafted\n XPM image file, a remote attacker could use this issue to cause libx11 to\n crash, leading to a denial of service, or possibly execute arbitrary code.\n (CVE-2023-43787)","dates":{"published":"2023-10-10T14:35:08.000Z","modified":"2026-06-29T13:50:57.927Z","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":"libx11","name":"libx11","label":"libx11","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libx11","purlType":"deb","versions":[{"text":"< 2:1.6.2-1ubuntu2.1+esm5","noFixRecorded":false,"fixedIn":null},{"text":"< 2:1.6.3-1ubuntu2.2+esm4","noFixRecorded":false,"fixedIn":null},{"text":"< 2:1.6.4-3ubuntu0.4+esm2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2:1.6.2-1ubuntu2.1+esm5 | < 2:1.6.3-1ubuntu2.2+esm4 | < 2:1.6.4-3ubuntu0.4+esm2","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-6407-2","label":"ubuntu.com/security/notices/USN-6407-2","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2023-43785","label":"ubuntu.com/security/CVE-2023-43785","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2023-43786","label":"ubuntu.com/security/CVE-2023-43786","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2023-43787","label":"ubuntu.com/security/CVE-2023-43787","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2023-43785","CVE-2023-43786","CVE-2023-43787"],"downstream":[],"duplicates":[],"related":["CVE-2023-43785","CVE-2023-43786","CVE-2023-43787"]},"timeline":[{"kind":"published","date":"2023-10-10T14:35:08.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-29T13:50:57.927Z","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":"2026-10-19T20:58:41.368Z","stale":false,"partial":false}}