CVE-2021-28658 — django
MEDIUMCVE-2021-28658 is a medium-severity (CVSS 5.3) Path Traversal vulnerability in django. A fix is available for django — see the affected versions and patch details below.
Directory Traversal in Django
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2021-28658 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
django🐍django🐍djangoReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
In Django 2.2 before 2.2.20, 3.0 before 3.0.14, and 3.1 before 3.1.8, MultiPartParser allowed directory traversal via uploaded files with suitably crafted file names. Built-in upload handlers were not affected by this vulnerability.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | django | ≥ 2.2a1&&< 2.2.20 | 2.2.20pip install --upgrade 'django==2.2.20' |
| 🐍PyPI | django | ≥ 3.0a1&&< 3.0.14 | 3.0.14pip install --upgrade 'django==3.0.14' |
| 🐍PyPI | django | ≥ 3.1a1&&< 3.1.8 | 3.1.8pip install --upgrade 'django==3.1.8' |
Affected Products
debian linuxdebiandjangodjangoprojectfedorafedoraprojectDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for django, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update django to 2.2.20 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-28658 is resolved across your whole dependency graph.
Workarounds
Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
Although Red Hat Ansible Tower ships the flawed code, it does not use the vulnerable function i.e. "MultiPartParser" and therefore will not be updated. Red Hat Update Infrastructure ship affected version of python-django however RHUI v3 is in maintenance support phase and we are only fixing critical and important…
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat OpenStack Platform 16.1 | python-django20-0:2.0.13-16.el8ost.1 | RHSA-2021:5070 |
| Red Hat Satellite 6.10 for RHEL 7 | python3-django-0:2.2.24-1.el7pc | RHSA-2021:4702 |
Frequently Asked Questions
Is CVE-2021-28658 in your dependencies?
Find it across PyPI, including transitive dependencies.