CVE-2011-1521

6.4 MEDIUM 4% exploit odds Fix listed

What it is

The urllib and urllib2 modules in Python 2.x before 2.7.2 and 3.x before 3.2.1 process Location headers that specify redirection to file: URLs, which makes it easier for remote attackers to obtain sensitive information or cause a denial of service (resource consumption) via a crafted URL, as demonstrated by the file:///etc/passwd and file:///dev/zero URLs.

At a glance

Exploitability: Can be exploited over the network without logging in. Limited direct impact.
Exploit odds: 3.6% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2011-05-24 23:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 23:29 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 3.6% in the next 30 days (EPSS).
Severity: 6.4 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2011-05-24 23:55 UTC
Last modified: 2026-06-16 23:29 UTC
Exploit probability: 3.6% · EPSS, next 30 days
Weakness: CWE-399
Record status: Modified

Affected

Python 2.0
Python 2.0.1
Python 2.1
Python 2.1.1
Python 2.1.2
Python 2.1.3
Python 2.2
Python 2.2.1

Attack profile CVSS 2.0 · 6.4

Attack vector: Network
Complexity: Low
Authentication: None
Confidentiality: Partial
Integrity: None
Availability: Partial

Raw vector

AV:N/AC:L/Au:N/C:P/I:N/A:P

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2011-1521.md and follow it. Check whether this project is affected by CVE-2011-1521. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record