{"id":"USN-4969-2","summary":"isc-dhcp vulnerability","details":"USN-4969-1 fixed a vulnerability in DHCP. This update provides\nthe corresponding update for Ubuntu 14.04 ESM and 16.04 ESM.\n\n\nOriginal advisory details:\n\n Jon Franklin and Pawel Wieczorkiewicz discovered that DHCP incorrectly\n handled lease file parsing. A remote attacker could possibly use this issue\n to cause DHCP to crash, resulting in a denial of service.\n","modified":"2026-04-22T10:15:22.451312Z","published":"2021-05-27T12:07:22Z","related":["UBUNTU-CVE-2021-25217"],"upstream":["CVE-2021-25217","UBUNTU-CVE-2021-25217"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4969-2"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-25217"}],"affected":[{"package":{"name":"isc-dhcp","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/isc-dhcp@4.2.4-7ubuntu12.13+esm1?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.2.4-7ubuntu12.13+esm1"}]}],"versions":["4.2.4-7ubuntu8","4.2.4-7ubuntu9","4.2.4-7ubuntu10","4.2.4-7ubuntu11","4.2.4-7ubuntu12","4.2.4-7ubuntu12.1","4.2.4-7ubuntu12.2","4.2.4-7ubuntu12.3","4.2.4-7ubuntu12.4","4.2.4-7ubuntu12.5","4.2.4-7ubuntu12.6","4.2.4-7ubuntu12.7","4.2.4-7ubuntu12.8","4.2.4-7ubuntu12.9","4.2.4-7ubuntu12.10","4.2.4-7ubuntu12.12","4.2.4-7ubuntu12.13"],"ecosystem_specific":{"binaries":[{"binary_name":"isc-dhcp-client","binary_version":"4.2.4-7ubuntu12.13+esm1"},{"binary_name":"isc-dhcp-client-noddns","binary_version":"4.2.4-7ubuntu12.13+esm1"},{"binary_name":"isc-dhcp-common","binary_version":"4.2.4-7ubuntu12.13+esm1"},{"binary_name":"isc-dhcp-relay","binary_version":"4.2.4-7ubuntu12.13+esm1"},{"binary_name":"isc-dhcp-server","binary_version":"4.2.4-7ubuntu12.13+esm1"},{"binary_name":"isc-dhcp-server-ldap","binary_version":"4.2.4-7ubuntu12.13+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-4969-2.json","cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2021-25217"}]}}},{"package":{"name":"isc-dhcp","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/isc-dhcp@4.3.3-5ubuntu12.10+esm1?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.3-5ubuntu12.10+esm1"}]}],"versions":["4.3.1-5ubuntu3","4.3.1-5ubuntu4","4.3.1-5ubuntu5","4.3.3-5ubuntu1","4.3.3-5ubuntu2","4.3.3-5ubuntu4","4.3.3-5ubuntu5","4.3.3-5ubuntu7","4.3.3-5ubuntu8","4.3.3-5ubuntu9","4.3.3-5ubuntu10","4.3.3-5ubuntu11","4.3.3-5ubuntu12","4.3.3-5ubuntu12.1","4.3.3-5ubuntu12.3","4.3.3-5ubuntu12.4","4.3.3-5ubuntu12.6","4.3.3-5ubuntu12.7","4.3.3-5ubuntu12.9","4.3.3-5ubuntu12.10"],"ecosystem_specific":{"binaries":[{"binary_name":"isc-dhcp-client","binary_version":"4.3.3-5ubuntu12.10+esm1"},{"binary_name":"isc-dhcp-client-ddns","binary_version":"4.3.3-5ubuntu12.10+esm1"},{"binary_name":"isc-dhcp-common","binary_version":"4.3.3-5ubuntu12.10+esm1"},{"binary_name":"isc-dhcp-relay","binary_version":"4.3.3-5ubuntu12.10+esm1"},{"binary_name":"isc-dhcp-server","binary_version":"4.3.3-5ubuntu12.10+esm1"},{"binary_name":"isc-dhcp-server-ldap","binary_version":"4.3.3-5ubuntu12.10+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-4969-2.json","cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2021-25217"}]}}}],"schema_version":"1.7.5"}