CVE-2016-5699

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Summary

CVECVE-2016-5699
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2016-09-02 14:59:07 UTC
Updated2026-05-06 22:30:45 UTC
DescriptionCRLF 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.

Risk And Classification

Primary CVSS: v3.0 6.1 MEDIUM from [email protected]

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

EPSS: 0.417140000 probability, percentile 0.974390000 (date 2026-05-06)

Problem Types: CWE-113 | n/a

VersionSourceTypeScoreSeverityVector
3.0[email protected]Primary6.1MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
2.0[email protected]Primary4.3AV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Python Python 3.0 All All All
Application Python Python 3.0.1 All All All
Application Python Python 3.1.0 All All All
Application Python Python 3.1.1 All All All
Application Python Python 3.1.2 All All All
Application Python Python 3.1.3 All All All
Application Python Python 3.1.4 All All All
Application Python Python 3.1.5 All All All
Application Python Python 3.2.0 All All All
Application Python Python 3.2.1 All All All
Application Python Python 3.2.2 All All All
Application Python Python 3.2.3 All All All
Application Python Python 3.2.4 All All All
Application Python Python 3.2.5 All All All
Application Python Python 3.2.6 All All All
Application Python Python 3.3.0 All All All
Application Python Python 3.3.1 All All All
Application Python Python 3.3.2 All All All
Application Python Python 3.3.3 All All All
Application Python Python 3.3.4 All All All
Application Python Python 3.3.5 All All All
Application Python Python 3.3.6 All All All
Application Python Python 3.4.0 All All All
Application Python Python 3.4.1 All All All
Application Python Python 3.4.2 All All All
Application Python Python 3.4.3 All All All
Application Python Python All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Splunk Enterprise 6.4.5 addresses multiple vulnerabilities | Splunk af854a3a-2127-422b-91ae-364da2661108 www.splunk.com
Changelog — Python 3.4.5 documentation af854a3a-2127-422b-91ae-364da2661108 docs.python.org Release Notes
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
cpython: bf3e1c9b80e9 af854a3a-2127-422b-91ae-364da2661108 hg.python.org Patch
hg.python.org/cpython/raw-file/v2.7.10/Misc/NEWS af854a3a-2127-422b-91ae-364da2661108 hg.python.org Release Notes
[security-announce] openSUSE-SU-2020:0086-1: important: Security update af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
Blindspot Security af854a3a-2127-422b-91ae-364da2661108 blog.blindspotsecurity.com Exploit, Third Party Advisory
oss-security - CVE request: Python HTTP header injection in urrlib2/urllib/httplib/http.client af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List
oss-security - Re: CVE request: Python HTTP header injection in urrlib2/urllib/httplib/http.client af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
cpython: 1c45047c5102 af854a3a-2127-422b-91ae-364da2661108 hg.python.org Patch
Oracle Solaris Bulletin - July 2016 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com
Python 'urrlib2/urllib/httplib/http.client' HTTP Header Injection Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com
[SECURITY] [DLA 1663-1] python3.4 security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
oss-security - Re: CVE request: Python HTTP header injection in urrlib2/urllib/httplib/http.client af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
Splunk Enterprise 6.5.1 addresses multiple OpenSSL vulnerabilities | Splunk af854a3a-2127-422b-91ae-364da2661108 www.splunk.com
Red Hat Customer Portal MITRE access.redhat.com
Red Hat Customer Portal MITRE access.redhat.com
Red Hat Customer Portal MITRE access.redhat.com
Red Hat Customer Portal MITRE access.redhat.com
Red Hat Customer Portal MITRE access.redhat.com
CVE-2016-5699 - Red Hat Customer Portal MITRE access.redhat.com
1303699 – (CVE-2016-5699) CVE-2016-5699 python: http protocol steam injection attack MITRE bugzilla.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 730315 Splunk Enterprise and Light Security Update (SP-CAAAPSV) (SPL-128812)

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