{"id":"USN-8110-1","summary":"libnet-cidr-perl vulnerability","details":"Dave Rolsky discovered that Net-CIDR did not properly sanitize IP\naddresses. An attacker could possibly use this to bypass IP-based\nrestrictions.","modified":"2026-05-20T16:03:58.871431366Z","published":"2026-03-18T19:40:53Z","related":["UBUNTU-CVE-2021-4456"],"upstream":["UBUNTU-CVE-2021-4456"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8110-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-4456"}],"affected":[{"package":{"name":"libnet-cidr-perl","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/libnet-cidr-perl?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.17-1ubuntu0.14.04.1~esm2"}]}],"versions":["0.17-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.17-1ubuntu0.14.04.1~esm2","binary_name":"libnet-cidr-perl"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8110-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[{"id":"CVE-2021-4456","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}]}}},{"package":{"name":"libnet-cidr-perl","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libnet-cidr-perl?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.17-1ubuntu0.16.04.1~esm2"}]}],"versions":["0.17-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.17-1ubuntu0.16.04.1~esm2","binary_name":"libnet-cidr-perl"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8110-1.json","cves_map":{"cves":[],"ecosystem":"Ubuntu:Pro:16.04:LTS"}}},{"package":{"name":"libnet-cidr-perl","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libnet-cidr-perl?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.18-1ubuntu0.1~esm2"}]}],"versions":["0.18-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.18-1ubuntu0.1~esm2","binary_name":"libnet-cidr-perl"}],"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-8110-1.json","cves_map":{"cves":[{"id":"CVE-2021-4456","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:Pro:18.04:LTS"}}},{"package":{"name":"libnet-cidr-perl","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/libnet-cidr-perl?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.20-1ubuntu0.1~esm2"}]}],"versions":["0.20-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.20-1ubuntu0.1~esm2","binary_name":"libnet-cidr-perl"}],"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-8110-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","cves":[{"id":"CVE-2021-4456","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}]}}},{"package":{"name":"libnet-cidr-perl","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libnet-cidr-perl?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.21-1ubuntu0.2"}]}],"versions":["0.20-1","0.21-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.21-1ubuntu0.2","binary_name":"libnet-cidr-perl"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8110-1.json","cves_map":{"cves":[{"id":"CVE-2021-4456","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:22.04:LTS"}}},{"package":{"name":"libnet-cidr-perl","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libnet-cidr-perl?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.21-2ubuntu0.2"}]}],"versions":["0.21-2"],"ecosystem_specific":{"binaries":[{"binary_version":"0.21-2ubuntu0.2","binary_name":"libnet-cidr-perl"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8110-1.json","cves_map":{"cves":[{"id":"CVE-2021-4456","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:24.04:LTS"}}}],"schema_version":"1.7.5"}