CVE-2015-5143

CVE-2015-5143 is a high-severity vulnerability in Djangoproject Django with a CVSS 2.0 base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

• Severity: High (CVSS 2.0 base score 7.8)
• EPSS exploit prediction: 7% (94th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-399
• Affected product: Djangoproject Django
• Published: 2015-07-14
• Last modified: 2026-06-17

Description

The session backends in Django before 1.4.21, 1.5.x through 1.6.x, 1.7.x before 1.7.9, and 1.8.x before 1.8.3 allows remote attackers to cause a denial of service (session store consumption) via multiple requests with unique session keys.

Frequently asked questions

What is CVE-2015-5143?

The session backends in Django before 1.4.21, 1.5.x through 1.6.x, 1.7.x before 1.7.9, and 1.8.x before 1.8.3 allows remote attackers to cause a denial of service (session store consumption) via multiple requests with unique session keys.

How severe is CVE-2015-5143?

CVE-2015-5143 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2015-5143 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-5143?

CVE-2015-5143 primarily affects Djangoproject Django. In total, 57 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-5143?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2015-5143 published?

CVE-2015-5143 was published on 2015-07-14 and last updated on 2026-06-17.

References

• http://lists.fedoraproject.org/pipermail/package-announce/2015-November/172084.html
• http://lists.opensuse.org/opensuse-updates/2015-10/msg00043.html
• http://lists.opensuse.org/opensuse-updates/2015-10/msg00046.html
• http://rhn.redhat.com/errata/RHSA-2015-1678.html
• http://rhn.redhat.com/errata/RHSA-2015-1686.html
• http://www.debian.org/security/2015/dsa-3305
• http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
• http://www.securityfocus.com/bid/75666
• http://www.securitytracker.com/id/1032820
• http://www.ubuntu.com/usn/USN-2671-1
• https://security.gentoo.org/glsa/201510-06
• https://www.djangoproject.com/weblog/2015/jul/08/security-releases/

Affected products (57)

• cpe:2.3:a:djangoproject:django:1.4.20:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.5:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.5:alpha:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.5:beta:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.5.1:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.5.2:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.5.3:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.5.4:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.5.5:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.5.6:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.5.7:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.5.8:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.5.9:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.5.10:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.5.11:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.5.12:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.6:-:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.6:beta1:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.6:beta2:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.6:beta3:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.6:beta4:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.6.1:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.6.2:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.6.3:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.6.4:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.6.5:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.6.6:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.6.7:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.6.8:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.6.9:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.6.10:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.7:beta1:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.7:beta2:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.7:beta3:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.7:beta4:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.7:rc1:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.7:rc2:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.7:rc3:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.7.1:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.7.2:*:*:*:*:*:*:*

More vulnerabilities in Djangoproject Django

• CVE-2014-0474 — Critical (CVSS 10.0): The (1) FilePathField, (2) GenericIPAddressField, and (3) IPAddressField model field classes in Django before 1.4.11,…
• CVE-2026-4277 — Critical (CVSS 9.8): An issue was discovered in 6.0 before 6.0.4, 5.2 before 5.2.13, and 4.2 before 4.2.30. Add permissions on inline model…
• CVE-2024-53908 — Critical (CVSS 9.8): An issue was discovered in Django 5.1 before 5.1.4, 5.0 before 5.0.10, and 4.2 before 4.2.17. Direct usage of the…
• CVE-2023-31047 — Critical (CVSS 9.8): In Django 3.2 before 3.2.19, 4.x before 4.1.9, and 4.2 before 4.2.1, it was possible to bypass validation when using…
• CVE-2022-34265 — Critical (CVSS 9.8): An issue was discovered in Django 3.2 before 3.2.14 and 4.0 before 4.0.6. The Trunc() and Extract() database functions…
• CVE-2022-28347 — Critical (CVSS 9.8): A SQL injection issue was discovered in QuerySet.explain() in Django 2.2 before 2.2.28, 3.2 before 3.2.13, and 4.0…

All CVEs affecting Djangoproject Django →

Other CWE-399 (Resource Management Errors) vulnerabilities

• CVE-2015-8104 — Critical (CVSS 10.0): The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a…
• CVE-2015-0339 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
• CVE-2015-0335 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
• CVE-2015-0333 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
• CVE-2014-4121 — Critical (CVSS 10.0): Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2 does not properly parse internationalized…
• CVE-2014-0560 — Critical (CVSS 10.0): Use-after-free vulnerability in Adobe Reader and Acrobat 10.x before 10.1.12 and 11.x before 11.0.09 on Windows and OS…

Browse all CWE-399 (Resource Management Errors) vulnerabilities →