What is CVE-2015-5143?

CVE-2015-5143 is a vulnerability in Djangoproject Django, classified under CWE-399. Published 2015-07-14.

Is CVE-2015-5143 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Djangoproject Django

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.

Published 2015-07-14 · last modified 2026-06-17.

CVSS v2 metric

CVSS v2 base score 7.8 (High). Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.073 (94.2th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 94.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.073 · newest: 0.073 · change: 0.000

Affected products

Djangoproject Django — versions 1.4.20, 1.5, 1.5.1
Oracle Solaris — versions 11.3
Canonical Ubuntu Linux — versions 12.04, 14.04, 15.04
Debian Linux — versions 7.0, 8.0

Weakness classification (CWE)

CWE-399

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

lists.fedoraproject.org/pipermail/package-announce/2015-November/172084.html (vendor-advisory)
security.gentoo.org/glsa/201510-06 (vendor-advisory)
www.djangoproject.com/weblog/2015/jul/08/security-releases/ (Patch, Vendor Advisory)
lists.opensuse.org/opensuse-updates/2015-10/msg00043.html (vendor-advisory)
lists.opensuse.org/opensuse-updates/2015-10/msg00046.html (vendor-advisory)
www.debian.org/security/2015/dsa-3305 (vendor-advisory, Third Party Advisory)
rhn.redhat.com/errata/RHSA-2015-1678.html (vendor-advisory)
www.securityfocus.com/bid/75666 (vdb-entry)
rhn.redhat.com/errata/RHSA-2015-1686.html (vendor-advisory)
www.ubuntu.com/usn/USN-2671-1 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2015-5143?: CVE-2015-5143 is a vulnerability in Djangoproject Django, classified under CWE-399. Published 2015-07-14.
Is CVE-2015-5143 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.