VulnerabilityModified

CVE-2018-1000164

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…

HIGH 7.5EPSS 2.37%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (2.37%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

CVSS 3.0: 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS: 2.37% probability · 84th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-93
Affected: gunicorn/gunicorn · debian/debian linux
Source: cve@mitre.org

EPSS trend

EPSS 2.4% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

https://epadillas.github.io/2018/04/02/http-header-splitting-in-gunicorn-19.4.5Exploit, Third Party Advisory
https://github.com/benoitc/gunicorn/issues/1227Exploit, Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/04/msg00022.htmlThird Party Advisory
https://usn.ubuntu.com/4022-1/
https://www.debian.org/security/2018/dsa-4186Third Party Advisory
https://epadillas.github.io/2018/04/02/http-header-splitting-in-gunicorn-19.4.5Exploit, Third Party Advisory
https://github.com/benoitc/gunicorn/issues/1227Exploit, Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/04/msg00022.htmlThird Party Advisory
https://usn.ubuntu.com/4022-1/
https://www.debian.org/security/2018/dsa-4186Third Party Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.