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CVE-2021-45115 — Denial-of-service in django — CVE Details

HIGH

Denial-of-service in Django

Published January 12, 2022Updated September 20, 2024Source: osv

What Should I Do?

Address in Next Maintenance Window

Low exploitation probability (0.39%). Schedule for your next planned update.

Summary

An issue was discovered in Django 2.2 before 2.2.26, 3.2 before 3.2.11, and 4.0 before 4.0.1. `UserAttributeSimilarityValidator` incurred significant overhead in evaluating a submitted password that was artificially large in relation to the comparison values. In a situation where access to user registration was unrestricted, this provided a potential vector for a denial-of-service attack.

Advisory Timeline

  • First published January 12, 2022 (1734 days ago).
  • Last revised September 20, 2024 — 982 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

pip
Update django to 3.2.11 or later
pip install "django>=3.2.11"
pip
Update django to 2.2.26 or later
pip install "django>=2.2.26"
pip
Update django to 4.0.1 or later
pip install "django>=4.0.1"

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, 3.2.10, 3.2.2 (+10 more)3.2.11
django
pypi
2.2, 2.2.1, 2.2.10, 2.2.11 (+25 more)2.2.26
django
pypi
4.0, 4.0a1, 4.0b1, 4.0rc14.0.1

Vulnerability Classification

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

  • CWE-400
    Uncontrolled Resource ConsumptionMITRE

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
None
Availability
High

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

References

Frequently Asked Questions

What is CVE-2021-45115?
Denial-of-service in Django 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-2021-45115?
CVE-2021-45115 affects django. It has a 0.4% probability of exploitation within 30 days (EPSS score). Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2021-45115 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)
0.39%
Higher than 60% of vulnerabilities

This is an above-median EPSS score — 59.9% of tracked vulnerabilities score at or below it, putting its exploitation likelihood in the upper half of the tracked corpus.

Also Known As

GHSA-53qw-q765-4fww
BIT-django-2021-45115
PYSEC-2022-1

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