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CVE-2021-33571

HIGH
7.5
CVSS Score
Published: June 8, 2021 at 12:00 AM UTC
Updated: June 17, 2026 at 03:54 AM UTC
2 products affected across 2 vendorsFedoraDjango

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Severity
HIGH7.5
Exploit prediction
EPSS 5%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Django· Djangoprojectpypi
95%
2.2 ≤ v < 2.2.243.0 ≤ v < 3.1.123.2 ≤ v < 3.2.4
Affected range stops below 2.2.24, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.1.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.2.4, so it looks safe — our inference, not a vendor statement
Fedora· Fedora Projectrpm
95%
35

References (8)

x_refsource_MISCPatchVendor Advisory
Source: [email protected]
https://docs.djangoproject.com/en/3.2/releases/security/
Source: [email protected]
https://github.com/django/django/commit/203d4ab9ebcd72fc4d6eb7398e66ed9e474e118e
Source: [email protected]
https://github.com/django/django/commit/9f75e2e562fa0c0482f3dde6fc7399a9070b4a3d
Source: [email protected]
https://github.com/django/django/commit/f27c38ab5d90f68c9dd60cabef248a570c0be8fc
Mailing ListThird Party Advisory
Source: [email protected]
https://groups.google.com/g/django-announce/c/sPyjSKMi8Eo
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/B4SQG2EAF4WCI2SLRL6XRDJ3RPK3ZRDV/
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20210727-0004/
x_refsource_CONFIRMPatchVendor Advisory
Source: [email protected]
https://www.djangoproject.com/weblog/2021/jun/02/security-releases/

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-918

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