{"id":"UBUNTU-CVE-2020-12662","details":"Unbound before 1.10.1 has Insufficient Control of Network Message Volume, aka an \"NXNSAttack\" issue. This is triggered by random subdomains in the NSDNAME in NS records.","modified":"2026-04-22T12:28:51.972318Z","published":"2020-05-19T11:00:00Z","related":["USN-4374-1"],"upstream":["CVE-2020-12662"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-12662"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2020/05/19/5"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4374-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-12662"}],"affected":[{"package":{"name":"unbound","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/unbound@1.4.22-1ubuntu4.14.04.3+esm2?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.20-1","1.4.21-1","1.4.21-1ubuntu1","1.4.21-1ubuntu2","1.4.22-1ubuntu1","1.4.22-1ubuntu2","1.4.22-1ubuntu3","1.4.22-1ubuntu4","1.4.22-1ubuntu4.14.04.1","1.4.22-1ubuntu4.14.04.2","1.4.22-1ubuntu4.14.04.3","1.4.22-1ubuntu4.14.04.3+esm1","1.4.22-1ubuntu4.14.04.3+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.4.22-1ubuntu4.14.04.3+esm2","binary_name":"libunbound2"},{"binary_version":"1.4.22-1ubuntu4.14.04.3+esm2","binary_name":"python-unbound"},{"binary_version":"1.4.22-1ubuntu4.14.04.3+esm2","binary_name":"unbound"},{"binary_version":"1.4.22-1ubuntu4.14.04.3+esm2","binary_name":"unbound-anchor"},{"binary_version":"1.4.22-1ubuntu4.14.04.3+esm2","binary_name":"unbound-host"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-12662.json"}},{"package":{"name":"unbound","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/unbound@1.5.8-1ubuntu1.1+esm2?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.22-1ubuntu6","1.5.7-1ubuntu1","1.5.7-1ubuntu2","1.5.8-1ubuntu1","1.5.8-1ubuntu1.1","1.5.8-1ubuntu1.1+esm1","1.5.8-1ubuntu1.1+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.5.8-1ubuntu1.1+esm2","binary_name":"libunbound2"},{"binary_version":"1.5.8-1ubuntu1.1+esm2","binary_name":"python-unbound"},{"binary_version":"1.5.8-1ubuntu1.1+esm2","binary_name":"unbound"},{"binary_version":"1.5.8-1ubuntu1.1+esm2","binary_name":"unbound-anchor"},{"binary_version":"1.5.8-1ubuntu1.1+esm2","binary_name":"unbound-host"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-12662.json"}},{"package":{"name":"unbound","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/unbound@1.6.7-1ubuntu2.3?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.7-1ubuntu2.3"}]}],"versions":["1.6.5-1","1.6.7-1","1.6.7-1build1","1.6.7-1ubuntu1","1.6.7-1ubuntu2","1.6.7-1ubuntu2.1","1.6.7-1ubuntu2.2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1.6.7-1ubuntu2.3","binary_name":"libunbound2"},{"binary_version":"1.6.7-1ubuntu2.3","binary_name":"python-unbound"},{"binary_version":"1.6.7-1ubuntu2.3","binary_name":"python3-unbound"},{"binary_version":"1.6.7-1ubuntu2.3","binary_name":"unbound"},{"binary_version":"1.6.7-1ubuntu2.3","binary_name":"unbound-anchor"},{"binary_version":"1.6.7-1ubuntu2.3","binary_name":"unbound-host"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-12662.json"}},{"package":{"name":"unbound","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/unbound@1.9.4-2ubuntu1.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.4-2ubuntu1.1"}]}],"versions":["1.9.0-2ubuntu1","1.9.0-2ubuntu2","1.9.4-2","1.9.4-2ubuntu1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1.9.4-2ubuntu1.1","binary_name":"libunbound8"},{"binary_version":"1.9.4-2ubuntu1.1","binary_name":"python-unbound"},{"binary_version":"1.9.4-2ubuntu1.1","binary_name":"python3-unbound"},{"binary_version":"1.9.4-2ubuntu1.1","binary_name":"unbound"},{"binary_version":"1.9.4-2ubuntu1.1","binary_name":"unbound-anchor"},{"binary_version":"1.9.4-2ubuntu1.1","binary_name":"unbound-host"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-12662.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}