{
    "data_type": "CVE",
    "data_format": "MITRE",
    "data_version": "4.0",
    "CVE_data_meta": {
        "ID": "CVE-2021-27862",
        "ASSIGNER": "cert@cert.org",
        "DATE_PUBLIC": "2022-09-27T01:00:00.000Z",
        "TITLE": "L2 network filtering bypass using stacked VLAN0 and LLC/SNAP headers with an invalid length during Ethernet to Wifi frame translation",
        "STATE": "PUBLIC"
    },
    "source": {
        "discovery": "EXTERNAL"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "IEEE",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "802.2",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_name": "802.2h-1997",
                                            "version_affected": "<=",
                                            "version_value": "802.2h-1997"
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                },
                {
                    "vendor_name": "IETF",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "draft-ietf-v6ops-ra-guard-08",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_name": "08",
                                            "version_affected": "<=",
                                            "version_value": "08"
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-130 Improper Handling of Length Parameter"
                    }
                ]
            },
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-290: Authentication Bypass by Spoofing"
                    }
                ]
            }
        ]
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length and Ethernet to Wifi frame conversion (and optionally VLAN0 headers)."
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "refsource": "MISC",
                "url": "https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/",
                "name": "https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/"
            },
            {
                "refsource": "MISC",
                "url": "https://standards.ieee.org/ieee/802.2/1048/",
                "name": "https://standards.ieee.org/ieee/802.2/1048/"
            },
            {
                "refsource": "MISC",
                "name": "https://kb.cert.org/vuls/id/855201",
                "url": "https://kb.cert.org/vuls/id/855201"
            },
            {
                "refsource": "MISC",
                "name": "https://blog.champtar.fr/VLAN0_LLC_SNAP/",
                "url": "https://blog.champtar.fr/VLAN0_LLC_SNAP/"
            }
        ]
    },
    "credit": [
        {
            "lang": "eng",
            "value": "Etienne Champetier (@champtar) <champetier.etienne@gmail.com> "
        }
    ]
}