{"schemaVersion":3,"id":"USN-6555-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"xorg-server, xwayland vulnerabilities\n\nJan-Niklas Sohn discovered that the X.Org X Server incorrectly handled XKB\nbutton actions. An attacker could possibly use this issue to cause the X\nServer to crash, execute arbitrary code, or escalate privileges.\n(CVE-2023-6377)\n\nJan-Niklas Sohn discovered that the X.Org X Server incorrectly handled\nmemory when processing the RRChangeOutputProperty and\nRRChangeProviderProperty APIs. An attacker could possibly use this issue to\ncause the X Server to crash, or obtain sensitive information.\n(CVE-2023-6478)","dates":{"published":"2023-12-13T13:23:48.000Z","modified":"2026-04-27T17:00:11.016Z","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":"xorg-server","name":"xorg-server","label":"xorg-server","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/xorg-server","purlType":"deb","versions":[{"text":"< 2:1.20.13-1ubuntu1~20.04.12","noFixRecorded":false,"fixedIn":null},{"text":"< 2:21.1.4-2ubuntu1.7~22.04.5","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2:1.20.13-1ubuntu1~20.04.12 | < 2:21.1.4-2ubuntu1.7~22.04.5","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"xwayland","name":"xwayland","label":"xwayland","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/xwayland","purlType":"deb","versions":[{"text":"< 2:22.1.1-1ubuntu0.9","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2:22.1.1-1ubuntu0.9","eol":null,"hubHref":null}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-6555-1","label":"ubuntu.com/security/notices/USN-6555-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2023-6377","label":"ubuntu.com/security/CVE-2023-6377","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2023-6478","label":"ubuntu.com/security/CVE-2023-6478","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2023-6377","CVE-2023-6478"],"downstream":[],"duplicates":[],"related":["CVE-2023-6377","CVE-2023-6478"]},"timeline":[{"kind":"published","date":"2023-12-13T13:23:48.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-27T17:00:11.016Z","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":"2026-10-19T21:35:45.139Z","stale":false,"partial":false}}