{"id":"USN-7836-2","summary":"bind9 vulnerabilities","details":"USN-7836-1 fixed vulnerabilities in Bind. This update provides the\ncorresponding fixes for Ubuntu 20.04 LTS.\n\nOriginal advisory details:\n\n Zuyao Xu and Xiang Li discovered that Bind incorrectly handled certain\n malformed DNSKEY records. A remote attacker could possibly use this issue\n to cause Bind to consume resources, resulting in a denial of service.\n (CVE-2025-8677)\n\n Yuxiao Wu, Yunyi Zhang, Baojun Liu, and Haixin Duan discovered that Bind\n incorrectly accepted certain records from answers. A remote attacker could\n possibly use this issue to perform a cache poisoning attack.\n (CVE-2025-40778)\n\n Amit Klein and Omer Ben Simhon discovered that Bind used a weak PRNG. A\n remote attacker could possibly use this issue to perform a cache poisoning\n attack. (CVE-2025-40780)","modified":"2026-04-27T18:23:54.382653Z","published":"2025-11-12T15:42:46Z","related":["UBUNTU-CVE-2025-40778","UBUNTU-CVE-2025-40780","UBUNTU-CVE-2025-8677"],"upstream":["CVE-2025-40778","CVE-2025-40780","CVE-2025-8677","UBUNTU-CVE-2025-40778","UBUNTU-CVE-2025-40780","UBUNTU-CVE-2025-8677"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7836-2"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-8677"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-40778"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-40780"}],"affected":[{"package":{"name":"bind9","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/bind9@1:9.18.30-0ubuntu0.20.04.2+esm1?arch=source&distro=esm-infra/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.18.30-0ubuntu0.20.04.2+esm1"}]}],"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","1:9.16.48-0ubuntu0.20.04.1","1:9.18.28-0ubuntu0.20.04.1","1:9.18.30-0ubuntu0.20.04.1","1:9.18.30-0ubuntu0.20.04.2"],"ecosystem_specific":{"binaries":[{"binary_name":"bind9","binary_version":"1:9.18.30-0ubuntu0.20.04.2+esm1"},{"binary_name":"bind9-dnsutils","binary_version":"1:9.18.30-0ubuntu0.20.04.2+esm1"},{"binary_name":"bind9-host","binary_version":"1:9.18.30-0ubuntu0.20.04.2+esm1"},{"binary_name":"bind9-libs","binary_version":"1:9.18.30-0ubuntu0.20.04.2+esm1"},{"binary_name":"bind9-utils","binary_version":"1:9.18.30-0ubuntu0.20.04.2+esm1"},{"binary_name":"bind9utils","binary_version":"1:9.18.30-0ubuntu0.20.04.2+esm1"},{"binary_name":"dnsutils","binary_version":"1:9.18.30-0ubuntu0.20.04.2+esm1"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7836-2.json","cves_map":{"cves":[{"id":"CVE-2025-8677","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2025-40778","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2025-40780","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:20.04:LTS"}}}],"schema_version":"1.7.5"}