{"id":"CVE-2020-37127","aliases":["DEBIAN-CVE-2020-37127","EUVD-2020-31023","GHSA-j2ph-f4fj-m4r3","UBUNTU-CVE-2020-37127","USN-8311-1"],"status":"published","title":"dnsmasq-utils 2.79-1 - 'dhcp_release' Denial of Service","description":"Dnsmasq-utils 2.79-1 contains a buffer overflow vulnerability in the dhcp_release utility that allows attackers to cause a denial of service by supplying excessive input. Attackers can trigger a core dump and terminate the dhcp_release process by sending a crafted input string longer than 16 characters.","severity":{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00207,"percentile":0.10891,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-121"],"published":"2026-02-05T16:13:33Z","modified":"2026-10-26T12:02:44Z","fixes":[{"ecosystem":"Debian:12","package":"dnsmasq","fixed_in":["2.80-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"dnsmasq","fixed_in":["2.80-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"dnsmasq","fixed_in":["2.80-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:14.04:LTS","package":"dnsmasq","fixed_in":["2.68-1ubuntu0.2+esm6"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:18.04:LTS","package":"dnsmasq","fixed_in":["2.90-0ubuntu0.18.04.1+esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"dnsmasq","fixed_in":["2.90-0ubuntu0.22.04.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"dnsmasq","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.80-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"dnsmasq","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.80-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"dnsmasq","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.80-1"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"dnsmasq","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.68-1ubuntu0.2+esm6"}]}],"versions":["2.66-4ubuntu1","2.67-1","2.68-1","2.68-1ubuntu0.1","2.68-1ubuntu0.2","2.68-1ubuntu0.2+esm1","2.68-1ubuntu0.2+esm2","2.68-1ubuntu0.2+esm3","2.68-1ubuntu0.2+esm5"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"dnsmasq","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.90-0ubuntu0.18.04.1+esm1"}]}],"versions":["2.78-1","2.78-3","2.79-1","2.79-1ubuntu0.2","2.79-1ubuntu0.3","2.79-1ubuntu0.4","2.79-1ubuntu0.5","2.79-1ubuntu0.6","2.79-1ubuntu0.7"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"dnsmasq","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.90-0ubuntu0.22.04.1"}]}],"versions":["2.85-1ubuntu2","2.86-1.1","2.86-1.1ubuntu0.1","2.86-1.1ubuntu0.2","2.86-1.1ubuntu0.3","2.86-1.1ubuntu0.4","2.86-1.1ubuntu0.5"]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"dnsmasq","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.68-1ubuntu0.2+esm6"}]}],"versions":["2.66-4ubuntu1","2.67-1","2.68-1","2.68-1ubuntu0.1","2.68-1ubuntu0.2","2.68-1ubuntu0.2+esm1","2.68-1ubuntu0.2+esm2","2.68-1ubuntu0.2+esm3","2.68-1ubuntu0.2+esm5"]}],"products":[{"vendor":"dnsmasq","product":"dnsmasq-utils"}],"references":[{"url":"https://www.exploit-db.com/exploits/48301","tags":["exploit","report"]},{"url":"https://launchpad.net/ubuntu/+source/dnsmasq/2.79-1","tags":["product","report"]},{"url":"https://www.vulncheck.com/advisories/dnsmasq-utils-dhcprelease-denial-of-service","tags":["third-party-advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-37127"},{"url":"https://github.com/advisories/GHSA-j2ph-f4fj-m4r3"},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-37127","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-37127","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-37127","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-8311-1","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2020-37127","title":"dnsmasq-utils 2.79-1 - 'dhcp_release' Denial of Service","description":"Dnsmasq-utils 2.79-1 contains a buffer overflow vulnerability in the dhcp_release utility that allows attackers to cause a denial of service by supplying excessive input. Attackers can trigger a core dump and terminate the dhcp_release process by sending a crafted input string longer than 16 characters.","status":"published","published":"2026-02-05T16:13:33.718Z","modified":"2026-02-05T21:18:03.656Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T14:35:47.22408Z"}],"euvd":[{"id":"EUVD-2020-31023","description":"Dnsmasq-utils 2.79-1 contains a buffer overflow vulnerability in the dhcp_release utility that allows attackers to cause a denial of service by supplying excessive input. Attackers can trigger a core dump and terminate the dhcp_release process by sending a crafted input string longer than 16 characters.","status":"published","published":"2026-02-05T16:13:33Z","modified":"2026-02-05T21:18:03Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T19:48:43.229255Z"}],"ghsa":[{"id":"GHSA-j2ph-f4fj-m4r3","title":"Dnsmasq-utils 2.79-1 contains a buffer overflow vulnerability in the dhcp_release utility that...","description":"Dnsmasq-utils 2.79-1 contains a buffer overflow vulnerability in the dhcp_release utility that allows attackers to cause a denial of service by supplying excessive input. Attackers can trigger a core dump and terminate the dhcp_release process by sending a crafted input string longer than 16 characters.","status":"published","published":"2026-02-05T18:30:31Z","modified":"2026-02-05T18:30:36Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T15:06:04.029234Z"}],"nvd":[{"id":"CVE-2020-37127","description":"Dnsmasq-utils 2.79-1 contains a buffer overflow vulnerability in the dhcp_release utility that allows attackers to cause a denial of service by supplying excessive input. Attackers can trigger a core dump and terminate the dhcp_release process by sending a crafted input string longer than 16 characters.","status":"published","published":"2026-02-05T17:16:07.54Z","modified":"2026-06-17T03:17:03.683Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T14:06:48.591569Z"}],"osv":[{"id":"DEBIAN-CVE-2020-37127","description":"Dnsmasq-utils 2.79-1 contains a buffer overflow vulnerability in the dhcp_release utility that allows attackers to cause a denial of service by supplying excessive input. Attackers can trigger a core dump and terminate the dhcp_release process by sending a crafted input string longer than 16 characters.","status":"published","published":"2026-02-05T17:16:07.54Z","modified":"2026-10-26T12:02:44.845006119Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"}],"updated_at":"2026-11-02T15:45:34.019707Z"},{"id":"UBUNTU-CVE-2020-37127","description":"Dnsmasq-utils 2.79-1 contains a buffer overflow vulnerability in the dhcp_release utility that allows attackers to cause a denial of service by supplying excessive input. Attackers can trigger a core dump and terminate the dhcp_release process by sending a crafted input string longer than 16 characters.","status":"published","published":"2026-02-05T17:16:00Z","modified":"2026-05-27T16:45:07.22302383Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"},{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T15:54:25.179924Z"},{"id":"USN-8311-1","title":"dnsmasq vulnerability","description":"Petr Menšík discovered that Dnsmasq incorrectly handled certain\ninput in the dhcp_release utility. A local attacker could possibly\nuse this issue to cause Dnsmasq to crash, resulting in a denial of\nservice.","status":"published","published":"2026-05-26T19:11:20Z","modified":"2026-05-27T16:59:13.914156085Z","updated_at":"2026-11-02T16:58:25.103481Z"}]}}