{"schemaVersion":3,"id":"USN-4698-2","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"dnsmasq regression\n\nUSN-4698-1 fixed vulnerabilities in Dnsmasq. The updates introduced\nregressions in certain environments related to issues with multiple\nqueries, and issues with retries. This update fixes the problem.\n\nOriginal advisory details:\n\n Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly handled\n memory when sorting RRsets. A remote attacker could use this issue to cause\n Dnsmasq to hang, resulting in a denial of service, or possibly execute\n arbitrary code. (CVE-2020-25681, CVE-2020-25687)\n\n Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly handled\n extracting certain names. A remote attacker could use this issue to cause\n Dnsmasq to hang, resulting in a denial of service, or possibly execute\n arbitrary code. (CVE-2020-25682, CVE-2020-25683)\n\n Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly\n implemented address/port checks. A remote attacker could use this issue to\n perform a cache poisoning attack. (CVE-2020-25684)\n\n Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly\n implemented query resource name checks. A remote attacker could use this\n issue to perform a cache poisoning attack. (CVE-2020-25685)\n\n Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly handled\n multiple query requests for the same resource name. A remote attacker could\n use this issue to perform a cache poisoning attack. (CVE-2020-25686)\n\n It was discovered that Dnsmasq incorrectly handled memory during DHCP\n response creation. A remote attacker could possibly use this issue to\n cause Dnsmasq to consume resources, leading to a denial of service. This\n issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04\n LTS. (CVE-2019-14834)","dates":{"published":"2021-02-24T13:43:44.000Z","modified":"2026-02-10T04:42:02.000Z","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":"< 2.75-1ubuntu0.16.04.8","noFixRecorded":false,"fixedIn":null},{"text":"< 2.79-1ubuntu0.3","noFixRecorded":false,"fixedIn":null},{"text":"< 2.80-1.1ubuntu1.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.75-1ubuntu0.16.04.8 | < 2.79-1ubuntu0.3 | < 2.80-1.1ubuntu1.3","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-4698-2","label":"ubuntu.com/security/notices/USN-4698-2","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://launchpad.net/bugs/1916462","label":"launchpad.net/bugs/1916462","hostname":"launchpad.net","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2021-02-24T13:43:44.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-02-10T04:42:02.000Z","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":"2026-10-19T21:40:47.237Z","stale":false,"partial":false}}