{
  "schema_version": "1.4.0",
  "id": "GHSA-433g-q37h-7crr",
  "modified": "2025-05-21T15:30:25Z",
  "published": "2022-09-28T00:00:18Z",
  "aliases": [
    "CVE-2021-27854"
  ],
  "details": "Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using combinations of VLAN 0 headers, LLC/SNAP headers, and converting frames from Ethernet to Wifi and its reverse.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N"
    }
  ],
  "affected": [],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-27854"
    },
    {
      "type": "WEB",
      "url": "https://blog.champtar.fr/VLAN0_LLC_SNAP"
    },
    {
      "type": "WEB",
      "url": "https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08"
    },
    {
      "type": "WEB",
      "url": "https://kb.cert.org/vuls/id/855201"
    },
    {
      "type": "WEB",
      "url": "https://standards.ieee.org/ieee/802.1Q/10323"
    },
    {
      "type": "WEB",
      "url": "https://standards.ieee.org/ieee/802.2/1048"
    }
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-290"
    ],
    "severity": "MODERATE",
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-09-27T19:15:00Z"
  }
}