cve-2021-27861
Vulnerability from cvelistv5
Published
2022-09-27 18:40
Modified
2024-09-16 16:47
Severity ?
Summary
L2 network filtering bypass using stacked VLAN0 and LLC/SNAP headers with invalid lengths
Impacted products
Vendor Product Version
IETF draft-ietf-v6ops-ra-guard Version: 08   <
IETF P802.1Q Version: D1.0   <
Show details on NVD website


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          "dateUpdated": "2024-08-03T21:33:17.074Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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          },
          {
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            "url": "https://standards.ieee.org/ieee/802.2/1048/"
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            "url": "https://standards.ieee.org/ieee/802.1Q/10323/"
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            "url": "https://kb.cert.org/vuls/id/855201"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://blog.champtar.fr/VLAN0_LLC_SNAP/"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "802.2",
          "vendor": "IEEE",
          "versions": [
            {
              "lessThanOrEqual": "802.2h-1997",
              "status": "affected",
              "version": "802.2h-1997",
              "versionType": "custom"
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          "vendor": "IETF",
          "versions": [
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              "version": "08",
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          "vendor": "IETF",
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              "status": "affected",
              "version": "D1.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Etienne Champetier (@champtar) \u003cchampetier.etienne@gmail.com\u003e"
        }
      ],
      "datePublic": "2022-09-27T00:00:00",
      "descriptions": [
        {
          "lang": "en",
          "value": "Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length (and optionally VLAN0 headers)"
        }
      ],
      "problemTypes": [
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          "descriptions": [
            {
              "cweId": "CWE-130",
              "description": "CWE-130 Improper Handling of Length Parameter",
              "lang": "en",
              "type": "CWE"
            }
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        },
        {
          "descriptions": [
            {
              "cweId": "CWE-290",
              "description": "CWE-290: Authentication Bypass by Spoofing",
              "lang": "en",
              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2022-10-12T00:00:00",
        "orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
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          "url": "https://standards.ieee.org/ieee/802.2/1048/"
        },
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          "url": "https://standards.ieee.org/ieee/802.1Q/10323/"
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          "url": "https://kb.cert.org/vuls/id/855201"
        },
        {
          "url": "https://blog.champtar.fr/VLAN0_LLC_SNAP/"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "L2 network filtering bypass using stacked VLAN0 and LLC/SNAP headers with invalid lengths"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b",
    "assignerShortName": "certcc",
    "cveId": "CVE-2021-27861",
    "datePublished": "2022-09-27T18:40:13.742316Z",
    "dateReserved": "2021-03-01T00:00:00",
    "dateUpdated": "2024-09-16T16:47:46.467Z",
    "state": "PUBLISHED"
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  }
}


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