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CVE-2016-5699

MediumPublished

CRLF injection vulnerability in the HTTPConnection.putheader function in urllib2 and urllib in CPython (aka Python) before 2.7.10 and 3.x before 3.4.4...

Published: Sep 2, 2016
Updated: Aug 6, 2024
Assigning CNA: redhat
Evidence observed: Aug 8, 2026

Primary CVSS

6.1/ 10Medium

nvd · CVSS 3.0

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS probability estimate

15.7%

Moderate · next 30 days

Percentile: 96.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

CRLF injection vulnerability in the HTTPConnection.putheader function in urllib2 and urllib in CPython (aka Python) before 2.7.10 and 3.x before 3.4.4 allows remote attackers to inject arbitrary HTTP headers via CRLF sequences in a URL.

Sources

CVE-2016-5699-pocPoC
PoC code of CVE-2016-5699 Vulnerability
cve-2016-5699-jinzheng-shaPoC
Reading Course Report

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