CVE-2011-4138

CVE-2011-4138 is a medium-severity vulnerability in Djangoproject Django with a CVSS 2.0 base score of 5.0. 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-20.

Key facts

• Severity: Medium (CVSS 2.0 base score 5.0)
• EPSS exploit prediction: 2% (82nd percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-20
• Affected product: Djangoproject Django
• Published: 2011-10-19
• Last modified: 2026-06-16

Description

The verify_exists functionality in the URLField implementation in Django before 1.2.7 and 1.3.x before 1.3.1 originally tests a URL's validity through a HEAD request, but then uses a GET request for the new target URL in the case of a redirect, which might allow remote attackers to trigger arbitrary GET requests with an unintended source IP address via a crafted Location header.

Frequently asked questions

What is CVE-2011-4138?

The verify_exists functionality in the URLField implementation in Django before 1.2.7 and 1.3.x before 1.3.1 originally tests a URL's validity through a HEAD request, but then uses a GET request for the new target URL in the case of a redirect, which might allow remote attackers to trigger arbitrary GET requests with an unintended source IP address via a crafted Location header.

How severe is CVE-2011-4138?

CVE-2011-4138 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2011-4138 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4138?

CVE-2011-4138 primarily affects Djangoproject Django. In total, 22 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-4138?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-4138 published?

CVE-2011-4138 was published on 2011-10-19 and last updated on 2026-06-16.

References

• http://openwall.com/lists/oss-security/2011/09/11/1
• http://openwall.com/lists/oss-security/2011/09/13/2
• 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/

Affected products (22)

• cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:0.91:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:0.95:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:0.95.1:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:0.96:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.0:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.1:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.1.2:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.1.3:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.2:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.2.1:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.2.1:2:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.2.2:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.2.3:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.2.4:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.2.5:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.3:*:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.3:alpha1:*:*:*:*:*:*
• cpe:2.3:a:djangoproject:django:1.3:alpha2:*:*:*:*:*:*

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