{"id":"UBUNTU-CVE-2025-40779","details":"If a DHCPv4 client sends a request with some specific options, and Kea fails to find an appropriate subnet for the client, the `kea-dhcp4` process will abort with an assertion failure.  This happens only if the client request is unicast directly to Kea; broadcast messages do not cause the problem. This issue affects Kea versions 2.7.1 through 2.7.9, 3.0.0, and 3.1.0.","modified":"2025-11-28T08:30:57.318322Z","published":"2025-08-27T21:15:00Z","withdrawn":"2025-11-28T05:19:59Z","upstream":["CVE-2025-40779"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-40779"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-40779"},{"type":"REPORT","url":"https://kb.isc.org/docs/cve-2025-40779"},{"type":"REPORT","url":"https://gitlab.isc.org/isc-projects/kea/-/commit/0afd42b5dfb2e547b3c25023953892c1e578aba3"},{"type":"REPORT","url":"https://gitlab.isc.org/isc-projects/kea/-/commit/b25d7e8a81273e4099bf6c7f639ed774de2f3d08"}],"affected":[{"package":{"name":"isc-kea","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/isc-kea@1.0.0-1ubuntu0.1~esm1?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.0-1","1.0.0-1build1","1.0.0-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"kea-admin","binary_version":"1.0.0-1ubuntu0.1~esm1"},{"binary_name":"kea-common","binary_version":"1.0.0-1ubuntu0.1~esm1"},{"binary_name":"kea-dev","binary_version":"1.0.0-1ubuntu0.1~esm1"},{"binary_name":"kea-dhcp-ddns-server","binary_version":"1.0.0-1ubuntu0.1~esm1"},{"binary_name":"kea-dhcp4-server","binary_version":"1.0.0-1ubuntu0.1~esm1"},{"binary_version":"1.0.0-1ubuntu0.1~esm1","binary_name":"kea-dhcp6-server"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-40779.json"}},{"package":{"name":"isc-kea","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/isc-kea@1.1.0-1ubuntu0.1~esm1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.0-1","1.1.0-1build1","1.1.0-1build2","1.1.0-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"kea-admin","binary_version":"1.1.0-1ubuntu0.1~esm1"},{"binary_name":"kea-common","binary_version":"1.1.0-1ubuntu0.1~esm1"},{"binary_name":"kea-dev","binary_version":"1.1.0-1ubuntu0.1~esm1"},{"binary_name":"kea-dhcp-ddns-server","binary_version":"1.1.0-1ubuntu0.1~esm1"},{"binary_name":"kea-dhcp4-server","binary_version":"1.1.0-1ubuntu0.1~esm1"},{"binary_version":"1.1.0-1ubuntu0.1~esm1","binary_name":"kea-dhcp6-server"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-40779.json"}},{"package":{"name":"isc-kea","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/isc-kea@1.6.2-0ubuntu1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5.0-2ubuntu1","1.5.0-2ubuntu2","1.5.0-2ubuntu3","1.6.1-0ubuntu1","1.6.1-0ubuntu2","1.6.2-0ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"kea-admin","binary_version":"1.6.2-0ubuntu1"},{"binary_name":"kea-common","binary_version":"1.6.2-0ubuntu1"},{"binary_name":"kea-ctrl-agent","binary_version":"1.6.2-0ubuntu1"},{"binary_version":"1.6.2-0ubuntu1","binary_name":"kea-dev"},{"binary_name":"kea-dhcp-ddns-server","binary_version":"1.6.2-0ubuntu1"},{"binary_name":"kea-dhcp4-server","binary_version":"1.6.2-0ubuntu1"},{"binary_name":"kea-dhcp6-server","binary_version":"1.6.2-0ubuntu1"},{"binary_name":"python3-kea-connector","binary_version":"1.6.2-0ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-40779.json"}},{"package":{"name":"isc-kea","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/isc-kea@2.0.2-1ubuntu0.1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.0-0ubuntu1","2.0.1-2","2.0.2-1","2.0.2-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.0.2-1ubuntu0.1","binary_name":"kea"},{"binary_name":"kea-admin","binary_version":"2.0.2-1ubuntu0.1"},{"binary_name":"kea-common","binary_version":"2.0.2-1ubuntu0.1"},{"binary_name":"kea-ctrl-agent","binary_version":"2.0.2-1ubuntu0.1"},{"binary_name":"kea-dev","binary_version":"2.0.2-1ubuntu0.1"},{"binary_name":"kea-dhcp-ddns-server","binary_version":"2.0.2-1ubuntu0.1"},{"binary_name":"kea-dhcp4-server","binary_version":"2.0.2-1ubuntu0.1"},{"binary_name":"kea-dhcp6-server","binary_version":"2.0.2-1ubuntu0.1"},{"binary_name":"python3-kea-connector","binary_version":"2.0.2-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-40779.json"}},{"package":{"name":"isc-kea","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/isc-kea@2.4.1-3ubuntu0.1?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.1-3","2.4.0-1","2.4.1-1","2.4.1-2build1","2.4.1-3build1","2.4.1-3build3","2.4.1-3build3.1","2.4.1-3ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"kea","binary_version":"2.4.1-3ubuntu0.1"},{"binary_name":"kea-admin","binary_version":"2.4.1-3ubuntu0.1"},{"binary_name":"kea-common","binary_v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