CVE-2021-45115: djangoproject django
Vulnerability summary
CVE-2021-45115 is a high (CVSS 7.5) vulnerability in djangoproject django. EPSS estimates a 2.60% chance of exploitation in the next 30 days, higher than 85.3% of scored vulnerabilities.
Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 3% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 13 · Related 10Timeline
- 04-01-2022PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
7 scores · 5 sources · 3 versions- OSV · PypiEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
2.60%
Chance of exploitation in the next 30 days
Percentile
85%
Versus all other CVEs
30-day change
Increase +0.18 pp
From 2.42% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Alpine1 product
- py3-django< 3.2.12-r0
Debian1 product
- python-django< 2:3.2.11-1
Djangoproject1 product
- django≥ 2.2, < 2.2.26 | ≥ 3.2, < 3.2.11 | ≥ 4.0, < 4.0.1
Fedoraproject1 product
- fedoraEOL35
PyPI1 product
- django≥ 2.2a1, < 2.2.26 | ≥ 3.2a1, < 3.2.11 | ≥ 4.0a1, < 4.0.1 | ≥ 4.0, < 4.0.1
Ubuntu1 product
- python-djangoAll versions (No fix recorded) | < 1:1.11.11-1ubuntu1.15 | < 2:2.2.12-1ubuntu0.9
6 vendors · 6 products
References
22 links- groups.google.com/forum/X Refsource MISC
- www.djangoproject.com/weblog/2022/jan/04/security-releases/X Refsource CONFIRMARTICLEPatchVendor Advisory
Show all 22 references
- github.com/django/djangoPACKAGE
