CVE-2011-1521

Python vulnerability

CVSS

6.4

EPSS

4.3%

EPSS pct

90th

Exploited

No known

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.

Affected vendor

Python

Affected product

Python

CVSS vector

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

Weakness type (CWE)

CWE-399

Published

2011-05-24

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to partial impact to confidentiality, partial impact to availability.

Its EPSS score of 4.3% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 90% of all scored CVEs.

Check your external exposure to CVE-2011-1521

Confirm whether Python Python is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2011-1521.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2011-1521

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