{"schemaVersion":3,"id":"USN-6657-2","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"dnsmasq vulnerabilities\n\nUSN-6657-1 fixed several vulnerabilities in Dnsmasq. This update provides\nthe corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.\n\nOriginal advisory details:\n\n Elias Heftrig, Haya Schulmann, Niklas Vogel, and Michael Waidner discovered\n that Dnsmasq icorrectly handled validating DNSSEC messages. A remote\n attacker could possibly use this issue to cause Dnsmasq to consume\n resources, leading to a denial of service. (CVE-2023-50387)\n\n It was discovered that Dnsmasq incorrectly handled preparing an NSEC3\n closest encloser proof. A remote attacker could possibly use this issue to\n cause Dnsmasq to consume resources, leading to a denial of service.\n (CVE-2023-50868)\n\n It was discovered that Dnsmasq incorrectly set the maximum EDNS.0 UDP\n packet size as required by DNS Flag Day 2020. This issue only affected\n Ubuntu 23.10. (CVE-2023-28450)","dates":{"published":"2024-04-24T19:55:01.000Z","modified":"2026-06-25T13:32:28.629Z","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":"dnsmasq","name":"dnsmasq","label":"dnsmasq","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/dnsmasq","purlType":"deb","versions":[{"text":"< 2.90-0ubuntu0.16.04.1+esm1","noFixRecorded":false,"fixedIn":null},{"text":"< 2.90-0ubuntu0.18.04.1+esm1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.90-0ubuntu0.16.04.1+esm1 | < 2.90-0ubuntu0.18.04.1+esm1","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-6657-2","label":"ubuntu.com/security/notices/USN-6657-2","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2023-28450","label":"ubuntu.com/security/CVE-2023-28450","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2023-50387","label":"ubuntu.com/security/CVE-2023-50387","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2023-50868","label":"ubuntu.com/security/CVE-2023-50868","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2023-28450","CVE-2023-50387","CVE-2023-50868"],"downstream":[],"duplicates":[],"related":["CVE-2023-28450","CVE-2023-50387","CVE-2023-50868"]},"timeline":[{"kind":"published","date":"2024-04-24T19:55:01.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-25T13:32:28.629Z","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":"2026-10-20T05:51:56.058Z","stale":false,"partial":false}}