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01 Record

CVE-2021-41084

Response Splitting from unsanitized headers in http4s

HighPUBLISHEDCNA: GitHub_M
CNA base score8.7 CVSS v3.xCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
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02 Description

Response Splitting from unsanitized headers in http4s

03 Exploitation and scoring

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
1.23% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 68.5% of scored records. A rank, not a probability.
NVD base score
4.7 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

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.

04 Metadata

Published
2021-09-21 17:20Z5 YR AGO
Last updated
2024-08-04 02:59Z2 YR AGO
Reserved
2021-09-15
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
High (CVSS 8.7)
CNA CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Weaknesses
  • CWE-918Server-Side Request Forgery (SSRF)Base
  • CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')Class
Data version
5.1
Document digest
22c96f9bd057b9166ff2db8749d8067016916520bf1cc9674c7ebf8e510cbfe2

05 Affected products

VendorProductVersionsPlatforms
http4shttp4s<= 0.21.28, >= 0.22.0, < 0.22.5, >= 0.23.0, < 0.23.4, >= 1.0.0-M1, < 1.0.0-M27—

06 References