{"id":"CVE-2021-33571","aliases":["BIT-django-2021-33571","GHSA-p99v-5w3c-jqq9","PYSEC-2021-99"],"url":"https://o3.security/vulnerability/CVE-2021-33571","summary":"Django Access Control Bypass possibly leading to SSRF, RFI, and LFI attacks ","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+..) .","published":"2021-06-08T18:15:08.517Z","modified":"2026-07-15T10:14:49.723784262Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"django","fixedVersion":"2.2.24"},{"ecosystem":"PyPI","name":"django","fixedVersion":"3.1.12"},{"ecosystem":"PyPI","name":"django","fixedVersion":"3.2.4"}],"fix":{"url":"https://github.com/django/django/commit/203d4ab9ebcd72fc4d6eb7398e66ed9e474e118e","label":"django/django@203d4ab"},"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/B4SQG2EAF4WCI2SLRL6XRDJ3RPK3ZRDV/"},{"type":"ADVISORY","url":"https://groups.google.com/g/django-announce/c/sPyjSKMi8Eo"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20210727-0004/"},{"type":"FIX","url":"https://docs.djangoproject.com/en/3.2/releases/security/"},{"type":"FIX","url":"https://github.com/django/django/commit/203d4ab9ebcd72fc4d6eb7398e66ed9e474e118e"},{"type":"FIX","url":"https://github.com/django/django/commit/9f75e2e562fa0c0482f3dde6fc7399a9070b4a3d"},{"type":"FIX","url":"https://github.com/django/django/commit/f27c38ab5d90f68c9dd60cabef248a570c0be8fc"},{"type":"FIX","url":"https://www.djangoproject.com/weblog/2021/jun/02/security-releases/"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T10:14:49.723784262Z"}}