{
    "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2021-32813",
        "STATE": "PUBLIC",
        "TITLE": "Drop Headers via Malicious Connection Header "
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "traefik",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "< 2.4.13"
                                        },
                                        {
                                            "version_value": "<= 1.7.30"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "traefik"
                }
            ]
        }
    },
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "Traefik is an HTTP reverse proxy and load balancer. Prior to version 2.4.13, there exists a potential header vulnerability in Traefik's handling of the Connection header. Active exploitation of this issue is unlikely, as it requires that a removed header would lead to a privilege escalation, however, the Traefik team has addressed this issue to prevent any potential abuse. If one has a chain of Traefik middlewares, and one of them sets a request header, then sending a request with a certain Connection header will cause it to be removed before the request is sent. In this case, the backend does not see the request header. A patch is available in version 2.4.13. There are no known workarounds aside from upgrading."
            }
        ]
    },
    "impact": {
        "cvss": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-913: Improper Control of Dynamically-Managed Code Resources"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "name": "https://github.com/traefik/traefik/security/advisories/GHSA-m697-4v8f-55qg",
                "refsource": "CONFIRM",
                "url": "https://github.com/traefik/traefik/security/advisories/GHSA-m697-4v8f-55qg"
            },
            {
                "name": "https://github.com/traefik/traefik/pull/8319/commits/cbaf86a93014a969b8accf39301932c17d0d73f9",
                "refsource": "MISC",
                "url": "https://github.com/traefik/traefik/pull/8319/commits/cbaf86a93014a969b8accf39301932c17d0d73f9"
            },
            {
                "name": "https://github.com/traefik/traefik/releases/tag/v2.4.13",
                "refsource": "MISC",
                "url": "https://github.com/traefik/traefik/releases/tag/v2.4.13"
            }
        ]
    },
    "source": {
        "advisory": "GHSA-m697-4v8f-55qg",
        "discovery": "UNKNOWN"
    }
}