{"id":"USN-6037-1","summary":"Apache Commons Net vulnerability","details":"ZeddYu Lu discovered that the FTP client from Apache Commons Net trusted\nthe host from PASV responses by default. A remote attacker with a\nmalicious FTP server could redirect the client to another server, which\ncould possibly result in leaked information about services running on the\nprivate network of the client.\n","modified":"2026-06-25T13:31:48.495902197Z","published":"2023-04-28T10:19:40Z","related":["UBUNTU-CVE-2021-37533"],"upstream":["CVE-2021-37533","UBUNTU-CVE-2021-37533"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6037-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-37533"}],"affected":[{"package":{"name":"libcommons-net-java","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libcommons-net-java?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4-2ubuntu2+esm1"}]}],"versions":["3.3-2","3.4-1","3.4-2","3.4-2ubuntu2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_version":"3.4-2ubuntu2+esm1","binary_name":"libcommons-net-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6037-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"id":"CVE-2021-37533","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]}]}}},{"package":{"name":"libcommons-net-java","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libcommons-net-java?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6-1+deb11u1build0.18.04.1"}]}],"versions":["3.6-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libcommons-net-java","binary_version":"3.6-1+deb11u1build0.18.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6037-1.json","cves_map":{"cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-37533"}],"ecosystem":"Ubuntu:18.04:LTS"}}},{"package":{"name":"libcommons-net-java","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libcommons-net-java?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6-1+deb11u1build0.20.04.1"}]}],"versions":["3.6-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libcommons-net-java","binary_version":"3.6-1+deb11u1build0.20.04.1"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2021-37533","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:20.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6037-1.json"}},{"package":{"name":"libcommons-net-java","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libcommons-net-java?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6-1+deb11u1build0.22.04.1"}]}],"versions":["3.6-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libcommons-net-java","binary_version":"3.6-1+deb11u1build0.22.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6037-1.json","cves_map":{"ecosystem":"Ubuntu:22.04:LTS","cves":[{"id":"CVE-2021-37533","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}]}}}],"schema_version":"1.7.5"}