🛡️ CVE-2021-45115 — django

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-400 OSV

8.0

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

Denial-of-service in Django

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2021-45115 is classified as CWE-400: Uncontrolled Resource Consumption. A request can consume memory, CPU or storage without limit, exhausting capacity for everyone else.

Affected software

CVE-2021-45115 is recorded against 1 package.

django (from 4.0 up to 4.0.1)

Timeline and source

Published on 5 January 2022 and last revised on 3 April 2025. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

docs.djangoproject.com (Web)
groups.google.com (Web)
www.djangoproject.com (Article)
github.com (Advisory)

CVE-2021-45115 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Debian Ubuntu

Details

Severity HIGH

CVSS Score 8.0

CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CWE CWE-400

Public Exploit ✅ No

Source OSV

Published 2022-01-05

Updated 2026-08-20

Modified 2025-04-03

Fix URL N/A

Affected Packages

Software	From version	Fixed in
django	4.0	4.0.1

References

WEB https://docs.djangoproject.com/en/4.0/releases/security/

WEB https://groups.google.com/forum/#!forum/django-announce

ARTICLE https://www.djangoproject.com/weblog/2022/jan/04/security-releases/

ADVISORY https://github.com/advisories/GHSA-53qw-q765-4fww

🔗 NVD 🔗 Mitre

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