{"id":"UBUNTU-CVE-2021-33571","details":"In Django 2.2 before 2.2.24, 3.x before 3.1.12, and 3.2 before 3.2.4, URLValidator, validate_ipv4_address, and validate_ipv46_address do not prohibit leading zero characters in octal literals. This may allow a bypass of access control that is based on IP addresses. (validate_ipv4_address and validate_ipv46_address are unaffected with Python 3.9.5+..) .","modified":"2026-02-04T04:17:01.890015Z","published":"2021-06-02T09:00:00Z","related":["USN-4975-1"],"upstream":["CVE-2021-33571"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-33571"},{"type":"REPORT","url":"https://www.djangoproject.com/weblog/2021/jun/02/security-releases/"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4975-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-33571"}],"affected":[{"package":{"name":"python-django","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/python-django@2:2.2.12-1ubuntu0.7?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:2.2.12-1ubuntu0.7"}]}],"versions":["1:1.11.22-1ubuntu1","2:2.2.6-1ubuntu1","2:2.2.9-2ubuntu1","2:2.2.10-1","2:2.2.10-1ubuntu1","2:2.2.11-1","2:2.2.12-1","2:2.2.12-1ubuntu0.1","2:2.2.12-1ubuntu0.2","2:2.2.12-1ubuntu0.3","2:2.2.12-1ubuntu0.4","2:2.2.12-1ubuntu0.5","2:2.2.12-1ubuntu0.6"],"ecosystem_specific":{"binaries":[{"binary_version":"2:2.2.12-1ubuntu0.7","binary_name":"python3-django"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33571.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}