CVE-2021-41084

unknown

Published 2021-09-22 · Modified 2026-03-13

💬 Discuss on Community ✚ Propose mitigation

CVSS v3

—

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

CVSS v4 NEW

—

not yet in upstream

VIR risk

—

Description

Response Splitting from unsanitized headers

Predictions

Exploit likelihood

30%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Package impact

Ecosystem	Package	Vulnerable	Fixed
Maven	org.http4s:http4s-client_2.12	`<0.21.29`	`0.21.29`
Maven	org.http4s:http4s-client_2.12	`>=0.22.0,<0.22.5`	`0.22.5`
Maven	org.http4s:http4s-client_2.12	`>=0.23.0,<0.23.4`	`0.23.4`
Maven	org.http4s:http4s-client_2.13	`<0.21.29`	`0.21.29`
Maven	org.http4s:http4s-client_2.13	`>=0.22.0,<0.22.5`	`0.22.5`
Maven	org.http4s:http4s-client_2.13	`>=0.23.0,<0.23.4`	`0.23.4`
Maven	org.http4s:http4s-client_3	`<0.21.29`	`0.21.29`
Maven	org.http4s:http4s-client_3	`>=0.22.0,<0.22.5`	`0.22.5`
Maven	org.http4s:http4s-client_3	`>=0.23.0,<0.23.4`	`0.23.4`
Maven	org.http4s:http4s-server_2.10	`<=0.21.28`
Maven	org.http4s:http4s-server_2.11	`<=0.21.28`
Maven	org.http4s:http4s-server_2.12	`<0.21.29`	`0.21.29`
Maven	org.http4s:http4s-server_2.12	`>=0.22.0,<0.22.5`	`0.22.5`
Maven	org.http4s:http4s-server_2.12	`>=0.23.0,<0.23.4`	`0.23.4`
Maven	org.http4s:http4s-server_2.13	`<0.21.29`	`0.21.29`
Maven	org.http4s:http4s-server_2.13	`>=0.22.0,<0.22.5`	`0.22.5`
Maven	org.http4s:http4s-server_2.13	`>=0.23.0,<0.23.4`	`0.23.4`
Maven	org.http4s:http4s-server_2.13.0-M5	`<=0.21.28`
Maven	org.http4s:http4s-server_3	`>=0.22.0,<0.22.5`	`0.22.5`
Maven	org.http4s:http4s-server_3	`>=0.23.0,<0.23.4`	`0.23.4`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.