{
    "data_type": "CVE",
    "data_format": "MITRE",
    "data_version": "4.0",
    "CVE_data_meta": {
        "ASSIGNER": "report@snyk.io",
        "DATE_PUBLIC": "2021-03-08T04:40:53.457117Z",
        "ID": "CVE-2021-23351",
        "STATE": "PUBLIC",
        "TITLE": "Denial of Service (DoS)"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "github.com/pires/go-proxyproto",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_value": "0.5.0"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "n/a"
                }
            ]
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "Denial of Service (DoS)"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "refsource": "MISC",
                "url": "https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMPIRESGOPROXYPROTO-1081577",
                "name": "https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMPIRESGOPROXYPROTO-1081577"
            },
            {
                "refsource": "MISC",
                "url": "https://github.com/pires/go-proxyproto/pull/71",
                "name": "https://github.com/pires/go-proxyproto/pull/71"
            },
            {
                "refsource": "MISC",
                "url": "https://github.com/pires/go-proxyproto/issues/69",
                "name": "https://github.com/pires/go-proxyproto/issues/69"
            },
            {
                "refsource": "MISC",
                "url": "https://github.com/pires/go-proxyproto/commit/7f48261db810703d173f27f3309a808cc2b49b8b",
                "name": "https://github.com/pires/go-proxyproto/commit/7f48261db810703d173f27f3309a808cc2b49b8b"
            },
            {
                "refsource": "FEDORA",
                "name": "FEDORA-2021-e01c1fe4cc",
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4BNVGJMVI3ZTZ675EFPUHPGXCKCGSX46/"
            },
            {
                "refsource": "FEDORA",
                "name": "FEDORA-2021-f5fcd9b0c1",
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/C36IBVOZXRTWM7MGTRUTOM56P5RR74VU/"
            }
        ]
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "The package github.com/pires/go-proxyproto before 0.5.0 are vulnerable to Denial of Service (DoS) via the parseVersion1() function. The reader in this package is a default bufio.Reader wrapping a net.Conn. It will read from the connection until it finds a newline. Since no limits are implemented in the code, a deliberately malformed V1 header could be used to exhaust memory in a server process using this code - and create a DoS. This can be exploited by sending a stream starting with PROXY and continuing to send data (which does not contain a newline) until the target stops acknowledging. The risk here is small, because only trusted sources should be allowed to send proxy protocol headers."
            }
        ]
    },
    "impact": {
        "cvss": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H",
            "baseScore": 4.4,
            "baseSeverity": "MEDIUM",
            "attackVector": "NETWORK",
            "attackComplexity": "HIGH",
            "privilegesRequired": "HIGH",
            "userInteraction": "NONE",
            "scope": "UNCHANGED",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "availabilityImpact": "HIGH"
        }
    },
    "credit": [
        {
            "lang": "eng",
            "value": "Iestyn Elfick"
        }
    ]
}