CVE-2018-1000164

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

2.41% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 83.0% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2018-04-18 19:00Z8 YR AGO

Last updated

2024-08-05 12:33Z2 YR AGO

Reserved

2018-04-02

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')Base
• CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')Variant

Data version

5.1

Document digest

7b073dc78dddcbcb3fe8b84e0eb7aaeb16bc3b133a159327c1f0f8360c96deb3

• epadillas.github.iohttps://epadillas.github.io/2018/04/02/http-header-splitting-in-gunicorn-19.4.5x_refsource_MISC
• lists.debian.org[debian-lts-announce] 20180422 [SECURITY] [DLA 1357-1] gunicorn security updatehttps://lists.debian.org/debian-lts-announce/2018/04/msg00022.htmlmailing-listx_refsource_MLIST
• github.comhttps://github.com/benoitc/gunicorn/issues/1227x_refsource_MISC
• www.debian.orgDSA-4186https://www.debian.org/security/2018/dsa-4186vendor-advisoryx_refsource_DEBIAN
• usn.ubuntu.comUSN-4022-1https://usn.ubuntu.com/4022-1/vendor-advisoryx_refsource_UBUNTU