{
    "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2021-41084",
        "STATE": "PUBLIC",
        "TITLE": "Response Splitting from unsanitized headers in http4s"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "http4s",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "<= 0.21.28"
                                        },
                                        {
                                            "version_value": ">= 0.22.0, < 0.22.5"
                                        },
                                        {
                                            "version_value": ">= 0.23.0, < 0.23.4"
                                        },
                                        {
                                            "version_value": ">= 1.0.0-M1, < 1.0.0-M27"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "http4s"
                }
            ]
        }
    },
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "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`\u00e5), 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."
            }
        ]
    },
    "impact": {
        "cvss": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-918: Server-Side Request Forgery (SSRF)"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "name": "https://github.com/http4s/http4s/security/advisories/GHSA-5vcm-3xc3-w7x3",
                "refsource": "CONFIRM",
                "url": "https://github.com/http4s/http4s/security/advisories/GHSA-5vcm-3xc3-w7x3"
            },
            {
                "name": "https://github.com/http4s/http4s/commit/d02007db1da4f8f3df2dbf11f1db9ac7afc3f9d8",
                "refsource": "MISC",
                "url": "https://github.com/http4s/http4s/commit/d02007db1da4f8f3df2dbf11f1db9ac7afc3f9d8"
            },
            {
                "name": "https://httpwg.org/http-core/draft-ietf-httpbis-semantics-latest.html#fields.values",
                "refsource": "MISC",
                "url": "https://httpwg.org/http-core/draft-ietf-httpbis-semantics-latest.html#fields.values"
            },
            {
                "name": "https://owasp.org/www-community/attacks/HTTP_Response_Splitting",
                "refsource": "MISC",
                "url": "https://owasp.org/www-community/attacks/HTTP_Response_Splitting"
            }
        ]
    },
    "source": {
        "advisory": "GHSA-5vcm-3xc3-w7x3",
        "discovery": "UNKNOWN"
    }
}