{"id":"UBUNTU-CVE-2017-15120","details":"An issue has been found in the parsing of authoritative answers in PowerDNS Recursor before 4.0.8, leading to a NULL pointer dereference when parsing a specially crafted answer containing a CNAME of a different class than IN. An unauthenticated remote attacker could cause a denial of service.","modified":"2025-09-08T16:44:27Z","published":"2018-07-27T15:29:00Z","upstream":["CVE-2017-15120"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2017-15120"},{"type":"REPORT","url":"https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2017-08.html"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2017-15120"}],"affected":[{"package":{"name":"pdns-recursor","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/pdns-recursor@4.0.0~alpha2-2ubuntu0.1+esm1?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.7.3-1","4.0.0~alpha1-1","4.0.0~alpha1-2","4.0.0~alpha2-2","4.0.0~alpha2-2ubuntu0.1","4.0.0~alpha2-2ubuntu0.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"pdns-recursor","binary_version":"4.0.0~alpha2-2ubuntu0.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2017/UBUNTU-CVE-2017-15120.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}