CVE-2014-4650

Name: CVE-2014-4650
Creator: NVD / NIST
Published: 2020-02-20T17:15:12.493+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 24.15%

Last modified Jun 17, 2026

CVE-2014-4650 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The CGIHTTPServer module in Python 2.7.5 and 3.3.4 does not properly handle URLs in which URL encoding is used for path separators, which allows remote attackers to read script source code or conduct directory traversal attacks and execute unintended code via a crafted character sequence, as demonstrated by a %2f separator.. EPSS estimates a 24.15% chance of exploitation in the next 30 days.

Description

The CGIHTTPServer module in Python 2.7.5 and 3.3.4 does not properly handle URLs in which URL encoding is used for path separators, which allows remote attackers to read script source code or conduct directory traversal attacks and execute unintended code via a crafted character sequence, as demonstrated by a %2f separator.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

24.15%

97.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Python	Python	>= 2.7.0, < 2.7.8
Python	Python	>= 3.2.0, < 3.2.6
Python	Python	>= 3.3.0, < 3.3.6
Python	Python	>= 3.4.0, < 3.4.2
Redhat	Software Collections	All versions
Redhat	Enterprise Linux	5.0
Redhat	Enterprise Linux	6.0
Redhat	Enterprise Linux	7.0

References

http://bugs.python.org/issue21766Exploit, Patch, Vendor Advisory
http://openwall.com/lists/oss-security/2014/06/26/3Mailing List, Third Party Advisory
https://access.redhat.com/security/cve/cve-2014-4650Third Party Advisory
http://bugs.python.org/issue21766Exploit, Patch, Vendor Advisory
http://openwall.com/lists/oss-security/2014/06/26/3Mailing List, Third Party Advisory
https://access.redhat.com/security/cve/cve-2014-4650Third Party Advisory

Timeline

Published: Feb 20, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2014-4650?

How severe is CVE-2014-4650?

CVE-2014-4650 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 24.15% probability of exploitation in the next 30 days.

How do I fix CVE-2014-4650?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2014-4650?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST