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CVE-2021-41084

8.7 · HIGH

http4s is an open source scala interface for HTTP.

Published Sep 21, 2021CWE-918EPSS 1.23%

Overview

CVE-2021-41084 is a high-severity vulnerability. It was published on September 21, 2021 and has a CVSS 3.1 base score of 8.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.7, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

http4s is an open source scala interface for HTTP. In affected versions http4s is vulnerable to response-splitting or request-splitting attacks when untrusted user input is used to create any of the following fields: Header names (`Header.name`å), Header values (`Header.value`), Status reason phrases (`Status.reason`), URI paths (`Uri.Path`), URI authority registered names (`URI.RegName`) (through 0.21). This issue has been resolved in versions 0.21.30, 0.22.5, 0.23.4, and 1.0.0-M27 perform the following. As a matter of practice http4s services and client applications should sanitize any user input in the aforementioned fields before returning a request or response to the backend. The carriage return, newline, and null characters are the most threatening.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/http4s/http4s/commit/d02007db1da4f8f3df2dbf11f1db9ac7afc3f9d8GitHubgithub.com/http4s/http4s/security/advisories/GHSA-5vcm-3xc3-w7x3Refhttpwg.org/http-core/draft-ietf-httpbis-semantics-latest.html#fields.valuesRefowasp.org/www-community/attacks/HTTP_Response_SplittingGitHubgithub.com/http4s/http4s/commit/d02007db1da4f8f3df2dbf11f1db9ac7afc3f9d8GitHubgithub.com/http4s/http4s/security/advisories/GHSA-5vcm-3xc3-w7x3Refhttpwg.org/http-core/draft-ietf-httpbis-semantics-latest.html#fields.valuesRefowasp.org/www-community/attacks/HTTP_Response_Splitting

How CyberStrike helps

Frequently asked questions

What is CVE-2021-41084?

CVE-2021-41084 is a high-severity vulnerability. It was published on September 21, 2021 and has a CVSS 3.1 base score of 8.7 (HIGH).

How severe is CVE-2021-41084?

This vulnerability has a CVSS 3.1 base score of 8.7, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-41084?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-41084?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-41084 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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