What’s Vulnerable › Vulnerabilities
CVE-2020-15225: Denial of Service vulnerability in django-filter
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.8% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2021-04-29 · updated 2026-06-17
- Weakness: CWE-681
Description
django-filter is a generic system for filtering Django QuerySets based on user selections. In django-filter before version 2.4.0, automatically generated `NumberFilter` instances, whose value was later converted to an integer, were subject to potential DoS from maliciously input using exponential format with sufficiently large exponents. Version 2.4.0+ applies a `MaxValueValidator` with a a default `limit_value` of 1e50 to the form field used by `NumberFilter` instances. In addition, `NumberFilter` implements the new `get_max_validator()` which should return a configured validator instance to customise the limit, or else `None` to disable the additional validation. Users may manually apply an equivalent validator if they are not able to upgrade.
Affected products
- Django-Filter Project Django-Filter: before 2.4.0 — fixed in 2.4.0
- Fedoraproject Fedora: 34, 35
How to fix
Upgrade to a fixed version: Django-Filter Project Django-Filter 2.4.0. Check the vendor advisory for mitigations.
References
- https://github.com/carltongibson/django-filter/commit/340cf7a23a2b3dcd7183f6a0d6c383e85b130d2b
- https://github.com/carltongibson/django-filter/releases/tag/2.4.0
- https://github.com/carltongibson/django-filter/security/advisories/GHSA-x7gm-rfgv-w973
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DPHENTRHRAYFXYPPBT7JRHZRWILRY44S/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FAT2ZAEF6DM3VFSOHKB7X3ASSHGQHJAK/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVJ7AYU6FUSU3F653YCGW5LFD3IULRSX/
- https://pypi.org/project/django-filter/
- https://security.netapp.com/advisory/ntap-20210604-0010/
- https://github.com/carltongibson/django-filter/commit/340cf7a23a2b3dcd7183f6a0d6c383e85b130d2b
- https://github.com/carltongibson/django-filter/releases/tag/2.4.0
- https://github.com/carltongibson/django-filter/security/advisories/GHSA-x7gm-rfgv-w973
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DPHENTRHRAYFXYPPBT7JRHZRWILRY44S/
Get alerted when CVE-2020-15225 or the next vulnerability affects your stack