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Vulnerability record · CVE-2021-33571 · published 8 June 2021

CVE-2021-33571: Djangoproject django server-side request forgery (ssrf) vulnerability

Djangoproject · Django

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+..) .

7.5 CVSS 3.1 High EPSS 5.3% · top 7.7% CWE-918 · Server-side request forgery (SSRF)
7.5CVSS 3.1 base score, v2 5.0
5.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
16References
17 Jun 2026Last modified by NVD

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+..) .

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://docs.djangoproject.com/en/3.2/releases/security/ PatchVendor Advisory
https://github.com/django/django/commit/203d4ab9ebcd72fc4d6eb7398e66ed9e474e118e
https://github.com/django/django/commit/9f75e2e562fa0c0482f3dde6fc7399a9070b4a3d
https://github.com/django/django/commit/f27c38ab5d90f68c9dd60cabef248a570c0be8fc
https://groups.google.com/g/django-announce/c/sPyjSKMi8Eo Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/B4SQG2EAF4WCI2SLRL6XRDJ
https://security.netapp.com/advisory/ntap-20210727-0004/ Third Party Advisory
https://www.djangoproject.com/weblog/2021/jun/02/security-releases/ PatchVendor Advisory
https://docs.djangoproject.com/en/3.2/releases/security/ PatchVendor Advisory
https://github.com/django/django/commit/203d4ab9ebcd72fc4d6eb7398e66ed9e474e118e
https://github.com/django/django/commit/9f75e2e562fa0c0482f3dde6fc7399a9070b4a3d
https://github.com/django/django/commit/f27c38ab5d90f68c9dd60cabef248a570c0be8fc
https://groups.google.com/g/django-announce/c/sPyjSKMi8Eo Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/B4SQG2EAF4WCI2SLRL6XRDJ
https://security.netapp.com/advisory/ntap-20210727-0004/ Third Party Advisory
https://www.djangoproject.com/weblog/2021/jun/02/security-releases/ PatchVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-33571), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.