{"id":"UBUNTU-CVE-2023-5517","details":"A flaw in query-handling code can cause `named` to exit prematurely with an assertion failure when:   - `nxdomain-redirect \u003cdomain\u003e;` is configured, and   - the resolver receives a PTR query for an RFC 1918 address that would normally result in an authoritative NXDOMAIN response. This issue affects BIND 9 versions 9.12.0 through 9.16.45, 9.18.0 through 9.18.21, 9.19.0 through 9.19.19, 9.16.8-S1 through 9.16.45-S1, and 9.18.11-S1 through 9.18.21-S1.","modified":"2026-04-22T17:26:57.206022Z","published":"2024-02-13T00:00:00Z","related":["USN-6633-1","USN-6642-1"],"upstream":["CVE-2023-5517"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-5517"},{"type":"REPORT","url":"https://kb.isc.org/docs/cve-2023-5517"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6633-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6642-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-5517"}],"affected":[{"package":{"name":"bind9","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/bind9@1:9.16.48-0ubuntu0.20.04.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.16.48-0ubuntu0.20.04.1"}]}],"versions":["1:9.11.5.P4+dfsg-5.1ubuntu2","1:9.11.5.P4+dfsg-5.1ubuntu3","1:9.11.5.P4+dfsg-5.1ubuntu4","1:9.11.5.P4+dfsg-5.1ubuntu5","1:9.11.14+dfsg-1ubuntu1","1:9.11.14+dfsg-3ubuntu1","1:9.16.0-1ubuntu3","1:9.16.0-1ubuntu4","1:9.16.0-1ubuntu5","1:9.16.1-0ubuntu1","1:9.16.1-0ubuntu2","1:9.16.1-0ubuntu2.1","1:9.16.1-0ubuntu2.2","1:9.16.1-0ubuntu2.3","1:9.16.1-0ubuntu2.4","1:9.16.1-0ubuntu2.6","1:9.16.1-0ubuntu2.7","1:9.16.1-0ubuntu2.8","1:9.16.1-0ubuntu2.9","1:9.16.1-0ubuntu2.10","1:9.16.1-0ubuntu2.11","1:9.16.1-0ubuntu2.12","1:9.16.1-0ubuntu2.14","1:9.16.1-0ubuntu2.15","1:9.16.1-0ubuntu2.16"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"bind9","binary_version":"1:9.16.48-0ubuntu0.20.04.1"},{"binary_name":"bind9-dnsutils","binary_version":"1:9.16.48-0ubuntu0.20.04.1"},{"binary_name":"bind9-host","binary_version":"1:9.16.48-0ubuntu0.20.04.1"},{"binary_name":"bind9-libs","binary_version":"1:9.16.48-0ubuntu0.20.04.1"},{"binary_version":"1:9.16.48-0ubuntu0.20.04.1","binary_name":"bind9-utils"},{"binary_name":"bind9utils","binary_version":"1:9.16.48-0ubuntu0.20.04.1"},{"binary_name":"dnsutils","binary_version":"1:9.16.48-0ubuntu0.20.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-5517.json"}},{"package":{"name":"bind9","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/bind9@1:9.18.18-0ubuntu0.22.04.2?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.18.18-0ubuntu0.22.04.2"}]}],"versions":["1:9.16.15-1ubuntu1","1:9.16.15-1ubuntu2","1:9.16.15-1ubuntu3","1:9.18.0-2ubuntu1","1:9.18.0-2ubuntu2","1:9.18.0-2ubuntu3","1:9.18.1-1ubuntu1","1:9.18.1-1ubuntu1.1","1:9.18.1-1ubuntu1.2","1:9.18.1-1ubuntu1.3","1:9.18.12-0ubuntu0.22.04.1","1:9.18.12-0ubuntu0.22.04.2","1:9.18.12-0ubuntu0.22.04.3","1:9.18.18-0ubuntu0.22.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"bind9","binary_version":"1:9.18.18-0ubuntu0.22.04.2"},{"binary_name":"bind9-dnsutils","binary_version":"1:9.18.18-0ubuntu0.22.04.2"},{"binary_name":"bind9-host","binary_version":"1:9.18.18-0ubuntu0.22.04.2"},{"binary_name":"bind9-libs","binary_version":"1:9.18.18-0ubuntu0.22.04.2"},{"binary_name":"bind9-utils","binary_version":"1:9.18.18-0ubuntu0.22.04.2"},{"binary_name":"bind9utils","binary_version":"1:9.18.18-0ubuntu0.22.04.2"},{"binary_version":"1:9.18.18-0ubuntu0.22.04.2","binary_name":"dnsutils"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-5517.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"}]}