CVE-2021-33571
HIGH7.5EPSS 0.04%Django Access Control Bypass possibly leading to SSRF, RFI, and LFI attacks
Published: 6/10/2021Modified: 4/28/2026
Description
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+..) .
Affected packages (4)
- Bitnami/django>= 2.2.0, < 2.2.24, >= 3.0.0, < 3.1.12, >= 3.2.0, < 3.2.4
- Debian/python-djangofrom 0, < 2:2.2.24-1
- PyPI/django>= 2.2a1, < 2.2.24
- PyPI/django>= 2.2, < 2.2.24, >= 3.0, < 3.1.12, >= 3.2, < 3.2.4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
References (18)
- ADVISORYhttps://github.com/advisories/GHSA-p99v-5w3c-jqq9
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2021-33571
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2021-33571
- ADVISORYhttps://www.djangoproject.com/weblog/2021/jun/02/security-releases/
- PATCHhttps://github.com/django/django
- WEBhttps://docs.djangoproject.com/en/3.2/releases/security
- WEBhttps://docs.djangoproject.com/en/3.2/releases/security/
- WEBhttps://github.com/django/django/commit/203d4ab9ebcd72fc4d6eb7398e66ed9e474e118e
- WEBhttps://github.com/django/django/commit/9f75e2e562fa0c0482f3dde6fc7399a9070b4a3d
- WEBhttps://github.com/django/django/commit/f27c38ab5d90f68c9dd60cabef248a570c0be8fc
- WEBhttps://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2021-99.yaml
- WEBhttps://groups.google.com/g/django-announce/c/sPyjSKMi8Eo
- WEBhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/B4SQG2EAF4WCI2SLRL6XRDJ3RPK3ZRDV
- WEBhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/B4SQG2EAF4WCI2SLRL6XRDJ3RPK3ZRDV/
- WEBhttps://lists.fedoraproject.org/archives/list/[email protected]/message/B4SQG2EAF4WCI2SLRL6XRDJ3RPK3ZRDV
- WEBhttps://security.netapp.com/advisory/ntap-20210727-0004
- WEBhttps://security.netapp.com/advisory/ntap-20210727-0004/
- WEBhttps://www.djangoproject.com/weblog/2021/jun/02/security-releases