{"id":"USN-4969-1","summary":"isc-dhcp vulnerability","details":"Jon Franklin and Pawel Wieczorkiewicz discovered that DHCP incorrectly\nhandled lease file parsing. A remote attacker could possibly use this issue\nto cause DHCP to crash, resulting in a denial of service.\n","modified":"2026-04-22T10:15:26.001305Z","published":"2021-05-27T10:41:47Z","related":["UBUNTU-CVE-2021-25217"],"upstream":["CVE-2021-25217","UBUNTU-CVE-2021-25217"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4969-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-25217"}],"affected":[{"package":{"name":"isc-dhcp","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/isc-dhcp@4.3.5-3ubuntu7.3?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.5-3ubuntu7.3"}]}],"versions":["4.3.5-3ubuntu2","4.3.5-3ubuntu3","4.3.5-3ubuntu4","4.3.5-3ubuntu5","4.3.5-3ubuntu6","4.3.5-3ubuntu7","4.3.5-3ubuntu7.1","4.3.5-3ubuntu7.2"],"ecosystem_specific":{"binaries":[{"binary_name":"isc-dhcp-client","binary_version":"4.3.5-3ubuntu7.3"},{"binary_name":"isc-dhcp-client-ddns","binary_version":"4.3.5-3ubuntu7.3"},{"binary_name":"isc-dhcp-common","binary_version":"4.3.5-3ubuntu7.3"},{"binary_name":"isc-dhcp-relay","binary_version":"4.3.5-3ubuntu7.3"},{"binary_name":"isc-dhcp-server","binary_version":"4.3.5-3ubuntu7.3"},{"binary_name":"isc-dhcp-server-ldap","binary_version":"4.3.5-3ubuntu7.3"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4969-1.json","cves_map":{"cves":[{"severity":[{"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":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-25217"}],"ecosystem":"Ubuntu:18.04:LTS"}}},{"package":{"name":"isc-dhcp","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/isc-dhcp@4.4.1-2.1ubuntu5.20.04.2?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.1-2.1ubuntu5.20.04.2"}]}],"versions":["4.4.1-2ubuntu5","4.4.1-2ubuntu6","4.4.1-2.1ubuntu1","4.4.1-2.1ubuntu2","4.4.1-2.1ubuntu3","4.4.1-2.1ubuntu4","4.4.1-2.1ubuntu5","4.4.1-2.1ubuntu5.20.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"isc-dhcp-client","binary_version":"4.4.1-2.1ubuntu5.20.04.2"},{"binary_name":"isc-dhcp-client-ddns","binary_version":"4.4.1-2.1ubuntu5.20.04.2"},{"binary_name":"isc-dhcp-common","binary_version":"4.4.1-2.1ubuntu5.20.04.2"},{"binary_name":"isc-dhcp-relay","binary_version":"4.4.1-2.1ubuntu5.20.04.2"},{"binary_name":"isc-dhcp-server","binary_version":"4.4.1-2.1ubuntu5.20.04.2"},{"binary_name":"isc-dhcp-server-ldap","binary_version":"4.4.1-2.1ubuntu5.20.04.2"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4969-1.json","cves_map":{"cves":[{"severity":[{"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":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-25217"}],"ecosystem":"Ubuntu:20.04:LTS"}}}],"schema_version":"1.7.5"}