{"id":"UBUNTU-CVE-2023-32067","details":"c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver sends a query, the attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver. The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. This issue has been patched in version 1.19.1.","modified":"2026-04-22T16:44:02.036531Z","published":"2023-05-25T23:15:00Z","related":["USN-6164-1","USN-6164-2"],"upstream":["CVE-2023-32067"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-32067"},{"type":"REPORT","url":"https://github.com/c-ares/c-ares/security/advisories/GHSA-9g78-jv2r-p7vc"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2023/05/22/2"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6164-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6164-2"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-32067"}],"affected":[{"package":{"name":"c-ares","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/c-ares@1.10.0-3ubuntu0.2+esm2?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.0-3ubuntu0.2+esm2"}]}],"versions":["1.10.0-2","1.10.0-3","1.10.0-3ubuntu0.1","1.10.0-3ubuntu0.2","1.10.0-3ubuntu0.2+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"libc-ares2","binary_version":"1.10.0-3ubuntu0.2+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-32067.json"}},{"package":{"name":"c-ares","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/c-ares@1.14.0-1ubuntu0.2+esm1?arch=source&distro=esm-infra/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.14.0-1ubuntu0.2+esm1"}]}],"versions":["1.13.0-2","1.13.0-3","1.14.0-1","1.14.0-1ubuntu0.1","1.14.0-1ubuntu0.2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"libc-ares2","binary_version":"1.14.0-1ubuntu0.2+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-32067.json"}},{"package":{"name":"c-ares","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/c-ares@1.15.0-1ubuntu0.3?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.15.0-1ubuntu0.3"}]}],"versions":["1.15.0-1build1","1.15.0-1ubuntu0.1","1.15.0-1ubuntu0.2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libc-ares2","binary_version":"1.15.0-1ubuntu0.3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-32067.json"}},{"package":{"name":"c-ares","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/c-ares@1.18.1-1ubuntu0.22.04.2?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.1-1ubuntu0.22.04.2"}]}],"versions":["1.17.1-1ubuntu1","1.18.1-1","1.18.1-1build1","1.18.1-1ubuntu0.22.04.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libc-ares2","binary_version":"1.18.1-1ubuntu0.22.04.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-32067.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":"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"}]}