Vulnerability Details CVE-2021-41084
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.007
EPSS Ranking 71.9%
CVSS Severity
CVSS v3 Score 8.7
CVSS v2 Score 4.3
Products affected by CVE-2021-41084
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cpe:2.3:a:typelevel:http4s:0.1.0
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cpe:2.3:a:typelevel:http4s:0.1.1
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cpe:2.3:a:typelevel:http4s:0.10.0
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cpe:2.3:a:typelevel:http4s:0.10.1
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cpe:2.3:a:typelevel:http4s:0.11.0
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cpe:2.3:a:typelevel:http4s:0.11.1
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cpe:2.3:a:typelevel:http4s:0.11.2
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cpe:2.3:a:typelevel:http4s:0.11.3
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cpe:2.3:a:typelevel:http4s:0.12.0
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cpe:2.3:a:typelevel:http4s:0.12.1
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cpe:2.3:a:typelevel:http4s:0.12.2
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cpe:2.3:a:typelevel:http4s:0.12.3
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cpe:2.3:a:typelevel:http4s:0.12.4
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cpe:2.3:a:typelevel:http4s:0.12.5
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cpe:2.3:a:typelevel:http4s:0.12.6
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cpe:2.3:a:typelevel:http4s:0.13.0
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cpe:2.3:a:typelevel:http4s:0.13.1
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cpe:2.3:a:typelevel:http4s:0.13.2
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cpe:2.3:a:typelevel:http4s:0.13.3
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cpe:2.3:a:typelevel:http4s:0.14.0
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cpe:2.3:a:typelevel:http4s:0.14.1
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cpe:2.3:a:typelevel:http4s:0.14.10
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cpe:2.3:a:typelevel:http4s:0.14.11
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cpe:2.3:a:typelevel:http4s:0.14.2
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cpe:2.3:a:typelevel:http4s:0.14.3
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cpe:2.3:a:typelevel:http4s:0.14.4
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cpe:2.3:a:typelevel:http4s:0.14.5
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cpe:2.3:a:typelevel:http4s:0.14.6
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cpe:2.3:a:typelevel:http4s:0.14.7
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cpe:2.3:a:typelevel:http4s:0.14.8
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cpe:2.3:a:typelevel:http4s:0.14.9
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cpe:2.3:a:typelevel:http4s:0.15.0
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cpe:2.3:a:typelevel:http4s:0.15.1
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cpe:2.3:a:typelevel:http4s:0.15.10
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cpe:2.3:a:typelevel:http4s:0.15.11
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cpe:2.3:a:typelevel:http4s:0.15.12
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cpe:2.3:a:typelevel:http4s:0.15.13
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cpe:2.3:a:typelevel:http4s:0.15.14
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cpe:2.3:a:typelevel:http4s:0.15.15
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cpe:2.3:a:typelevel:http4s:0.15.16
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cpe:2.3:a:typelevel:http4s:0.15.2
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cpe:2.3:a:typelevel:http4s:0.15.3
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cpe:2.3:a:typelevel:http4s:0.15.4
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cpe:2.3:a:typelevel:http4s:0.15.5
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cpe:2.3:a:typelevel:http4s:0.15.6
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cpe:2.3:a:typelevel:http4s:0.15.7
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cpe:2.3:a:typelevel:http4s:0.15.8
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cpe:2.3:a:typelevel:http4s:0.15.9
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cpe:2.3:a:typelevel:http4s:0.16.0
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cpe:2.3:a:typelevel:http4s:0.16.1
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cpe:2.3:a:typelevel:http4s:0.16.2
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cpe:2.3:a:typelevel:http4s:0.16.3
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cpe:2.3:a:typelevel:http4s:0.16.4
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cpe:2.3:a:typelevel:http4s:0.16.5
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cpe:2.3:a:typelevel:http4s:0.16.6
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cpe:2.3:a:typelevel:http4s:0.17.0
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cpe:2.3:a:typelevel:http4s:0.17.1
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cpe:2.3:a:typelevel:http4s:0.17.2
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cpe:2.3:a:typelevel:http4s:0.17.3
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cpe:2.3:a:typelevel:http4s:0.17.4
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cpe:2.3:a:typelevel:http4s:0.17.5
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cpe:2.3:a:typelevel:http4s:0.17.6
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cpe:2.3:a:typelevel:http4s:0.18.0
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cpe:2.3:a:typelevel:http4s:0.18.1
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cpe:2.3:a:typelevel:http4s:0.18.10
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cpe:2.3:a:typelevel:http4s:0.18.11
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cpe:2.3:a:typelevel:http4s:0.18.12
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cpe:2.3:a:typelevel:http4s:0.18.13
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cpe:2.3:a:typelevel:http4s:0.18.14
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cpe:2.3:a:typelevel:http4s:0.18.15
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cpe:2.3:a:typelevel:http4s:0.18.16
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cpe:2.3:a:typelevel:http4s:0.18.17
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cpe:2.3:a:typelevel:http4s:0.18.18
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cpe:2.3:a:typelevel:http4s:0.18.19
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cpe:2.3:a:typelevel:http4s:0.18.2
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cpe:2.3:a:typelevel:http4s:0.18.20
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cpe:2.3:a:typelevel:http4s:0.18.21
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cpe:2.3:a:typelevel:http4s:0.18.22
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cpe:2.3:a:typelevel:http4s:0.18.23
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cpe:2.3:a:typelevel:http4s:0.18.24
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cpe:2.3:a:typelevel:http4s:0.18.25
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cpe:2.3:a:typelevel:http4s:0.18.26
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cpe:2.3:a:typelevel:http4s:0.18.3
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cpe:2.3:a:typelevel:http4s:0.18.4
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cpe:2.3:a:typelevel:http4s:0.18.5
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cpe:2.3:a:typelevel:http4s:0.18.6
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cpe:2.3:a:typelevel:http4s:0.18.7
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cpe:2.3:a:typelevel:http4s:0.18.8
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cpe:2.3:a:typelevel:http4s:0.18.9
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cpe:2.3:a:typelevel:http4s:0.19.0
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cpe:2.3:a:typelevel:http4s:0.2.0
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cpe:2.3:a:typelevel:http4s:0.20.0
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cpe:2.3:a:typelevel:http4s:0.20.1
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cpe:2.3:a:typelevel:http4s:0.20.10
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cpe:2.3:a:typelevel:http4s:0.20.11
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cpe:2.3:a:typelevel:http4s:0.20.12
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cpe:2.3:a:typelevel:http4s:0.20.13
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cpe:2.3:a:typelevel:http4s:0.20.14
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cpe:2.3:a:typelevel:http4s:0.20.15
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cpe:2.3:a:typelevel:http4s:0.20.16
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cpe:2.3:a:typelevel:http4s:0.20.17
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cpe:2.3:a:typelevel:http4s:0.20.18
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cpe:2.3:a:typelevel:http4s:0.20.19
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cpe:2.3:a:typelevel:http4s:0.20.2
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cpe:2.3:a:typelevel:http4s:0.20.20
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cpe:2.3:a:typelevel:http4s:0.20.21
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cpe:2.3:a:typelevel:http4s:0.20.22
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cpe:2.3:a:typelevel:http4s:0.20.23
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cpe:2.3:a:typelevel:http4s:0.20.3
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cpe:2.3:a:typelevel:http4s:0.20.4
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cpe:2.3:a:typelevel:http4s:0.20.6
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cpe:2.3:a:typelevel:http4s:0.20.7
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cpe:2.3:a:typelevel:http4s:0.20.8
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cpe:2.3:a:typelevel:http4s:0.20.9
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cpe:2.3:a:typelevel:http4s:0.21.0
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cpe:2.3:a:typelevel:http4s:0.21.1
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cpe:2.3:a:typelevel:http4s:0.21.11
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cpe:2.3:a:typelevel:http4s:0.21.12
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cpe:2.3:a:typelevel:http4s:0.21.13
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cpe:2.3:a:typelevel:http4s:0.21.14
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cpe:2.3:a:typelevel:http4s:0.21.15
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cpe:2.3:a:typelevel:http4s:0.21.16
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cpe:2.3:a:typelevel:http4s:0.21.17
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cpe:2.3:a:typelevel:http4s:0.21.18
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cpe:2.3:a:typelevel:http4s:0.21.19
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cpe:2.3:a:typelevel:http4s:0.21.2
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cpe:2.3:a:typelevel:http4s:0.21.20
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cpe:2.3:a:typelevel:http4s:0.21.21
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cpe:2.3:a:typelevel:http4s:0.21.22
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cpe:2.3:a:typelevel:http4s:0.21.23
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cpe:2.3:a:typelevel:http4s:0.21.24
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cpe:2.3:a:typelevel:http4s:0.21.28
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cpe:2.3:a:typelevel:http4s:0.21.3
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cpe:2.3:a:typelevel:http4s:0.21.4
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cpe:2.3:a:typelevel:http4s:0.21.5
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cpe:2.3:a:typelevel:http4s:0.21.6
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cpe:2.3:a:typelevel:http4s:0.21.7
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cpe:2.3:a:typelevel:http4s:0.21.8
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cpe:2.3:a:typelevel:http4s:0.21.9
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cpe:2.3:a:typelevel:http4s:0.22.0
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cpe:2.3:a:typelevel:http4s:0.22.1
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cpe:2.3:a:typelevel:http4s:0.22.2
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cpe:2.3:a:typelevel:http4s:0.22.3
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cpe:2.3:a:typelevel:http4s:0.22.4
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cpe:2.3:a:typelevel:http4s:0.23.0
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cpe:2.3:a:typelevel:http4s:0.23.1
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cpe:2.3:a:typelevel:http4s:0.23.2
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cpe:2.3:a:typelevel:http4s:0.23.3
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cpe:2.3:a:typelevel:http4s:0.3.0
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cpe:2.3:a:typelevel:http4s:0.4.0
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cpe:2.3:a:typelevel:http4s:0.4.1
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cpe:2.3:a:typelevel:http4s:0.4.2
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cpe:2.3:a:typelevel:http4s:0.5.0
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cpe:2.3:a:typelevel:http4s:0.5.1
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cpe:2.3:a:typelevel:http4s:0.5.2
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cpe:2.3:a:typelevel:http4s:0.5.3
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cpe:2.3:a:typelevel:http4s:0.5.4
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cpe:2.3:a:typelevel:http4s:0.6.0
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cpe:2.3:a:typelevel:http4s:0.6.1
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cpe:2.3:a:typelevel:http4s:0.6.2
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cpe:2.3:a:typelevel:http4s:0.6.3
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cpe:2.3:a:typelevel:http4s:0.6.4
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cpe:2.3:a:typelevel:http4s:0.6.5
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cpe:2.3:a:typelevel:http4s:0.7.0
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cpe:2.3:a:typelevel:http4s:0.8.0
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cpe:2.3:a:typelevel:http4s:0.8.1
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cpe:2.3:a:typelevel:http4s:0.8.2
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cpe:2.3:a:typelevel:http4s:0.8.3
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cpe:2.3:a:typelevel:http4s:0.8.4
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cpe:2.3:a:typelevel:http4s:0.8.5
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cpe:2.3:a:typelevel:http4s:0.8.6
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cpe:2.3:a:typelevel:http4s:0.9.0
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cpe:2.3:a:typelevel:http4s:0.9.1
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cpe:2.3:a:typelevel:http4s:0.9.2
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cpe:2.3:a:typelevel:http4s:0.9.3
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cpe:2.3:a:typelevel:http4s:1.0.0