How severe is CVE-2013-1664?

No CVSS score has been assigned to CVE-2013-1664 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2013-1664?

CVE-2013-1664 affects the following packages: django (PyPI), django (PyPI). Ecosystems affected: PyPI.

How do I fix CVE-2013-1664?

Update django to 1.3.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2013-1664 is resolved across your whole dependency graph.

How do I detect CVE-2013-1664 in my PyPI dependencies?

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.

How do I mitigate CVE-2013-1664 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against CVE-2013-1664?

O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2013-1664 can be triaged on real exposure rather than presence alone.

Is CVE-2013-1664 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2013-1664, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2013-1664?

CVE-2013-1664 has an EPSS (Exploit Prediction Scoring System) score of 4.9%, placing it in the 92th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2013-1664?

CVE-2013-1664 is classified as Buffer Overflow (CWE-119). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2013-1664 published, and has it been updated?

CVE-2013-1664 was published on April 3, 2013 and was last updated on July 7, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐍 PyPI

Not in CISA KEV

CVE-2013-1664 — django

Fix: django/django@1c60d07

CVE-2013-1664 is a Buffer Overflow vulnerability in django. 1 public exploit reference exists, so weaponization risk is real. A fix is available for django — see the affected versions and patch details below.

XML Entity Expansion (XEE) in Django

Also known asGHSA-qrh7-x6fp-c2mpPYSEC-2026-801

Published

Apr 3, 2013

Updated

Jul 7, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

1 known

Exploitation data as of Sep 21, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

4.9%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs92th percentile — riskier than 92% of all scored CVEsHighest risk

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Real-World Exposure

2 pkgs affected

🐍django🐍django

Real-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

The XML libraries for Python 3.4, 3.3, 3.2, 3.1, 2.7, and 2.6, as used in OpenStack Keystone Essex, Folsom, and Grizzly; Compute (Nova) Essex and Folsom; Cinder Folsom; Django; and possibly other products allow remote attackers to cause a denial of service (resource consumption and crash) via an XML Entity Expansion (XEE) attack.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`django`	≥ 1.3.0&&< 1.3.6	1.3.6`pip install --upgrade 'django==1.3.6'`
🐍PyPI	`django`	≥ 1.4.0&&< 1.4.4	1.4.4`pip install --upgrade 'django==1.4.4'`

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

The XML libraries for Python 3.4, 3.3, 3.2, 3.1, 2.7, and 2.6, as used i…

bugs.launchpad.netNVDMay 2013

Detection & mitigation playbook

Open-source dependency

Detect
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 1.3.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2013-1664 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2013-1664 can be triaged on real exposure rather than presence alone.

Tailored to CVE-2013-1664. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

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.

Red HatModerate

This issue affects the versions of python as shipped with Red Hat Enterprise Linux 5, 6 and 7. Red Hat Product Security has rated this issue as having Moderate security impact. This issue is not currently planned to be addressed in future updates.

Product	Fixed in	Advisory
OpenStack Folsom for RHEL 6	`openstack-keystone-0:2012.2.3-3.el6ost`	RHSA-2013:0596
OpenStack Folsom for RHEL 6	`openstack-nova-0:2012.2.3-4.el6ost`	RHSA-2013:0657
OpenStack Folsom for RHEL 6	`openstack-cinder-0:2012.2.3-4.el6ost`	RHSA-2013:0658
OpenStack Folsom for RHEL 6	`Django14-0:1.4.4-1.el6ost`	RHSA-2013:0670

Ubuntu

USN-1731-1Ubuntu USN-1757-1Ubuntu USN-1730-1Ubuntu USN-1734-1Ubuntu

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2013-1664 in your dependencies?

O3 Security finds CVE-2013-1664 across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

Scan my dependencies How O3 SCA works