CVE-2013-1443: Denial of Service in Django
Summary
CVE-2013-1443: The authentication framework (django.contrib.auth) in Django 1.4.x before 1.4.8, 1.5.x before 1.5.4, and 1.6.x before 1.6 beta 4 allows remote attackers to cause a denial of service (CPU consumption) via a long password... Affects django across 2 version ranges.
>= 1.4, < 1.4.8
>= 1.5, < 1.5.4
Fixed in 1.4.8 or 1.5.4, depending on the release line you run. How to fix ↓
Also tracked for
- python-django · Debian:11
The same CVE-2013-1443 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.
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Background
Django is a popular Python web framework used for building web applications. It includes an authentication framework called django.contrib.auth, which provides user authentication and authorization functionalities. This vulnerability affects Django versions 1.4.x before 1.4.8, 1.5.x before 1.5.4, and 1.6.x before 1.6 beta 4. The vulnerability allows remote attackers to cause a denial of service (CPU consumption) by exploiting a flaw in the password hashing mechanism.
Vulnerability Detail
The vulnerability arises from a weakness in the password hashing process implemented by the authentication framework in Django. When a long password is provided, the framework consumes excessive CPU resources during the hashing operation, leading to a denial of service condition. This vulnerability can be exploited remotely, allowing attackers to disrupt the availability of affected Django applications.
How To Fix
Latest published version: 6.1.2 as of 22 Oct 2026
pip install --upgrade "django==6.1.2"Upgrading to it may include breaking changes; the versions below are the minimum fixed release for this vulnerability.
If you can't move to the latest
The minimum fixed version depends on the release line you run.
-
>= 1.4, < 1.4.81.4.8pip install --upgrade "django==1.4.8" -
>= 1.5, < 1.5.41.5.4pip install --upgrade "django==1.5.4"
Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →
Workaround
There is no known workaround for this vulnerability. It is essential to apply the recommended fix by upgrading Django to a patched version.
Conclusion
The vulnerability in Django's authentication framework can be exploited by remote attackers to cause a denial of service by consuming excessive CPU resources during the password hashing process. To mitigate this risk, it is crucial to upgrade Django to a patched version. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability allows remote attackers to cause a denial of service by exploiting a flaw in the password hashing mechanism. This can lead to the unavailability of affected Django applications.
Yes, remote attackers can exploit this vulnerability to trigger a denial of service condition.
Django versions 1.4.x before 1.4.8, 1.5.x before 1.5.4, and 1.6.x before 1.6 beta 4 are affected by this vulnerability.
No, there is no known workaround. It is necessary to upgrade Django to a patched version.
To fix this vulnerability, upgrade Django to version 1.4.8, 1.5.4, or a later release.
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