CVE-2011-4137

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2011-10-19 · updated 2026-06-16
Weakness: CWE-399

Description

The verify_exists functionality in the URLField implementation in Django before 1.2.7 and 1.3.x before 1.3.1 relies on Python libraries that attempt access to an arbitrary URL with no timeout, which allows remote attackers to cause a denial of service (resource consumption) via a URL associated with (1) a slow response, (2) a completed TCP connection with no application data sent, or (3) a large amount of application data, a related issue to CVE-2011-1521.

Affected products

Django: through 1.2.6; 0.91, 0.95, 0.95.1, 0.96, 1.0, 1.0.1 (+15)

References

http://openwall.com/lists/oss-security/2011/09/11/1
http://openwall.com/lists/oss-security/2011/09/13/2
http://openwall.com/lists/oss-security/2011/09/15/5
http://secunia.com/advisories/46614
http://www.debian.org/security/2011/dsa-2332
https://bugzilla.redhat.com/show_bug.cgi?id=737366
https://hermes.opensuse.org/messages/14700881
https://www.djangoproject.com/weblog/2011/sep/09/
https://www.djangoproject.com/weblog/2011/sep/10/127/
http://openwall.com/lists/oss-security/2011/09/11/1
http://openwall.com/lists/oss-security/2011/09/13/2
http://openwall.com/lists/oss-security/2011/09/15/5

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