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CVE-2021-33571 — Vulnerability in django — CVE Details

HIGH

Django Access Control Bypass possibly leading to SSRF, RFI, and LFI attacks

Published June 10, 2021Updated September 20, 2024Source: osv

What Should I Do?

Address in Next Maintenance Window

Low exploitation probability (0.03%). Schedule for your next planned update.

Summary

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+..) .

Advisory Timeline

  • First published June 10, 2021 (1950 days ago).
  • Last revised September 20, 2024 — 1198 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

pip
Update django to 3.2.4 or later
pip install "django>=3.2.4"
pip
Update django to 3.1.12 or later
pip install "django>=3.1.12"
pip
Update django to 2.2.24 or later
pip install "django>=2.2.24"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (3)

Affects 1 ecosystem: pypi (1).

PackageEcosystemAffectedFixed In
django
pypi
3.2, 3.2.1, 3.2.2, 3.2.3 (+3 more)3.2.4
django
pypi
3.0, 3.0.1, 3.0.10, 3.0.11 (+29 more)3.1.12
django
pypi
2.2, 2.2.1, 2.2.10, 2.2.11 (+23 more)2.2.24

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-918
    Server-Side Request Forgery (SSRF)MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.5 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

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

References

Frequently Asked Questions

What is CVE-2021-33571?
Django Access Control Bypass possibly leading to SSRF, RFI, and LFI attacks This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.5/10).
How do I check if my project is affected by CVE-2021-33571?
CVE-2021-33571 affects django. It has a 0.03% probability of exploitation within 30 days (EPSS score). Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2021-33571 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.5

High exploitability or significant impact. Prioritize remediation within days.

EPSS Score (30-day exploit probability)
0.03%
Higher than 9% of vulnerabilities

This is a below-median EPSS score — only 9% of tracked vulnerabilities score at or below it, so most tracked vulnerabilities are considered more likely to be exploited than this one.

Also Known As

GHSA-p99v-5w3c-jqq9
BIT-django-2021-33571
PYSEC-2021-99

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