Is CVE-2016-5699 in the CISA KEV catalog?

No. CVE-2016-5699 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-5699?

CVE-2016-5699 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2016-5699?

CVE-2016-5699 has an EPSS score of 9.89% (95th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-5699?

Upgrade python2.7 on debian 11 to 2.7.10~rc1-1 or later. Fixes are available for 16 affected products.

CVE & CISA-KEV Catalog

CVE-2016-5699

MEDIUMEPSS 95th pctl

6.1

CVSS v3

NVD

Description

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.

CWE-113

How to fix

Remediation Available

python2.7Debian

Fixed in:2.7.10~rc1-1CVE-2016-5699

libpython2.7Ubuntu

Fixed in:2.7.6-8ubuntu0.3USN-3134-1

Fixed in:2.7.12-1ubuntu0~16.04.1USN-3134-1

libpython2.7-minimalUbuntu

Fixed in:2.7.6-8ubuntu0.3USN-3134-1

Fixed in:2.7.12-1ubuntu0~16.04.1USN-3134-1

libpython2.7-stdlibUbuntu

Fixed in:2.7.6-8ubuntu0.3USN-3134-1

Fixed in:2.7.12-1ubuntu0~16.04.1USN-3134-1

libpython3.4Ubuntu

Fixed in:3.4.3-1ubuntu1~14.04.5USN-3134-1

libpython3.4-minimalUbuntu

Fixed in:3.4.3-1ubuntu1~14.04.5USN-3134-1

libpython3.4-stdlibUbuntu

Fixed in:3.4.3-1ubuntu1~14.04.5USN-3134-1

libpython3.5Ubuntu

Fixed in:3.5.2-2ubuntu0~16.04.1USN-3134-1

libpython3.5-minimalUbuntu

Fixed in:3.5.2-2ubuntu0~16.04.1USN-3134-1

libpython3.5-stdlibUbuntu

Fixed in:3.5.2-2ubuntu0~16.04.1USN-3134-1

python2.7Ubuntu

Fixed in:2.7.6-8ubuntu0.3USN-3134-1

Fixed in:2.7.12-1ubuntu0~16.04.1USN-3134-1

python2.7-minimalUbuntu

Fixed in:2.7.6-8ubuntu0.3USN-3134-1

Fixed in:2.7.12-1ubuntu0~16.04.1USN-3134-1

python3.4Ubuntu

Fixed in:3.4.3-1ubuntu1~14.04.5USN-3134-1

python3.4-minimalUbuntu

Fixed in:3.4.3-1ubuntu1~14.04.5USN-3134-1

python3.5Ubuntu

Fixed in:3.5.2-2ubuntu0~16.04.1USN-3134-1

python3.5-minimalUbuntu

Fixed in:3.5.2-2ubuntu0~16.04.1USN-3134-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

9.89%probability of exploitation in 30 days

95thpercentile

High risk: more likely to be exploited than 95% of all known CVEs.

References

Patch2

Exploit1

blog.blindspotsecurity.com

Mailing List3

Release Notes2

Other references11

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.