CVE-2018-1000164

mediumpriority · track · 31EPSS 0.024 · 84 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

2.37% (84th) EPSS

CVSS 5 · medium

Is it mine?

11 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

gunicorn version 19.4.5 contains a CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers vulnerability in "process_headers" function in "gunicorn/http/wsgi.py" that can result in an attacker causing the server to return arbitrary HTTP headers. This vulnerability appears to have been fixed in 19.5.0.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nsecondary · OSV

v3.06.9mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nsecondary · FSTEC (BDU) RU

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-93USprimaryCWE-113USCWE-93USCWE-93US

affected products (11)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
Canonical Ltd. Ubuntu≤ 16.04 LTSfstec_bduRU
Novell Inc. OpenSUSE Leap≤ 42.3fstec_bduRU
Red Hat Inc. Red Hat Enterprise Linux≤ 7fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 7fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 8fstec_bduRU
Сообщество свободного программного обеспечения gunicorn≤ 19.4.5fstec_bduRU
debian debian linux= 7.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
debian debian linux= 8.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
gunicorn gunicorn= 19.4.5nvdUScpe:2.3:a:gunicorn:gunicorn:*:*:*:*:*:*:*:*
PyPI gunicorn< 19.5.0osvUSpkg:pypi/gunicorn

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-32pc-xphx-q4f6Gunicorn contains Improper Neutralization of CRLF sequences in HTTP headers2018-07-12ghsa · osvUS
gunicorn version 19.4.5 contains a CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers vulnerability in "process_headers" function in "gunicorn/http/wsgi.py" that can result in an attacker causing the server to return arbitrary HTTP headers. This vulnerability appears to have been fixed in 19.5.0.
PYSEC-2018-552018-04-18vendor · osvUS
gunicorn version 19.4.5 contains a CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers vulnerability in "process_headers" function in "gunicorn/http/wsgi.py" that can result in an attacker causing the server to return arbitrary HTTP headers. This vulnerability appears to have been fixed in 19.5.0.

also known as (7)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu osv nvd NVD CVE.org MITRE

published 2018-04-18modified 2026-06-17

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references (17)

External citations — patches, advisories, analysis.

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