Search

Find a vulnerability

Search criteria

    1 vulnerability found for n9k-x9564tx by cisco

    VAR-202209-1859

    Vulnerability from variot - Updated: 2025-11-18 15:12

    Layer 2 network filtering capabilities such as IPv6 RA guard or ARP inspection can be bypassed using combinations of VLAN 0 headers and LLC/SNAP headers. Layer-2 (L2) network security controls provided by various devices, such as switches, routers, and operating systems, can be bypassed by stacking Ethernet protocol headers. An attacker can send crafted packets through vulnerable devices to cause Denial-of-service (DoS) or to perform a man-in-the-middle (MitM) attack against a target network.CVE-2021-27853 Affected CVE-2021-27854 Affected CVE-2021-27861 Affected CVE-2021-27862 AffectedCVE-2021-27853 Affected CVE-2021-27854 Affected CVE-2021-27861 Affected CVE-2021-27862 Affected. IEEE of ieee 802.2 Products from multiple other vendors contain vulnerabilities related to authentication bypass through spoofing.Information may be tampered with

    Show details on source website

    {
      "@context": {
        "@vocab": "https://www.variotdbs.pl/ref/VARIoTentry#",
        "affected_products": {
          "@id": "https://www.variotdbs.pl/ref/affected_products"
        },
        "credits": {
          "@id": "https://www.variotdbs.pl/ref/credits"
        },
        "cvss": {
          "@id": "https://www.variotdbs.pl/ref/cvss/"
        },
        "description": {
          "@id": "https://www.variotdbs.pl/ref/description/"
        },
        "exploit_availability": {
          "@id": "https://www.variotdbs.pl/ref/exploit_availability/"
        },
        "external_ids": {
          "@id": "https://www.variotdbs.pl/ref/external_ids/"
        },
        "iot": {
          "@id": "https://www.variotdbs.pl/ref/iot/"
        },
        "iot_taxonomy": {
          "@id": "https://www.variotdbs.pl/ref/iot_taxonomy/"
        },
        "patch": {
          "@id": "https://www.variotdbs.pl/ref/patch/"
        },
        "problemtype_data": {
          "@id": "https://www.variotdbs.pl/ref/problemtype_data/"
        },
        "references": {
          "@id": "https://www.variotdbs.pl/ref/references/"
        },
        "sources": {
          "@id": "https://www.variotdbs.pl/ref/sources/"
        },
        "sources_release_date": {
          "@id": "https://www.variotdbs.pl/ref/sources_release_date/"
        },
        "sources_update_date": {
          "@id": "https://www.variotdbs.pl/ref/sources_update_date/"
        },
        "threat_type": {
          "@id": "https://www.variotdbs.pl/ref/threat_type/"
        },
        "title": {
          "@id": "https://www.variotdbs.pl/ref/title/"
        },
        "type": {
          "@id": "https://www.variotdbs.pl/ref/type/"
        }
      },
      "@id": "https://www.variotdbs.pl/vuln/VAR-202209-1859",
      "affected_products": {
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/affected_products#",
          "data": {
            "@container": "@list"
          },
          "sources": {
            "@container": "@list",
            "@context": {
              "@vocab": "https://www.variotdbs.pl/ref/sources#"
            },
            "@id": "https://www.variotdbs.pl/ref/sources"
          }
        },
        "data": [
          {
            "model": "meraki ms420",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": null
          },
          {
            "model": "nexus 93108tc-fx",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "n9k-x9464px",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "nexus 9736pq",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "nexus x9636q-r",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "meraki ms350",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": null
          },
          {
            "model": "sg500x-48p",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "3.0.0.61"
          },
          {
            "model": "nexus 9516",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "n9k-x9736c-ex",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "catalyst 6509-v-e",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "15.5\\(01.01.85\\)sy07"
          },
          {
            "model": "nexus 93108tc-ex",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "sg500-28mpp",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "3.0.0.61"
          },
          {
            "model": "n9k-c9348d-gx2a",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "sf-500-24mp",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "3.0.0.61"
          },
          {
            "model": "meraki ms250",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": null
          },
          {
            "model": "nexus 9364c-gx",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "n9k-x9636c-rx",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "nexus 9336c-fx2-e",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "sf500-18p",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "3.0.0.61"
          },
          {
            "model": "ios xe",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "17.4.1"
          },
          {
            "model": "meraki ms450",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": null
          },
          {
            "model": "sf500-48mp",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "3.0.0.61"
          },
          {
            "model": "catalyst 6503-e",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "15.5\\(01.01.85\\)sy07"
          },
          {
            "model": "n9k-x9788tc-fx",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "nexus 9716d-gx",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "sf500-48",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "3.0.0.61"
          },
          {
            "model": "sg500x-48",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "3.0.0.61"
          },
          {
            "model": "nexus 93108tc-fx3p",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "nexus 9636pq",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "n9k-x9636c-r",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "sg500-28",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "3.0.0.61"
          },
          {
            "model": "sg500x-24mpp",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "3.0.0.61"
          },
          {
            "model": "nexus 92160yc-x",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "catalyst c6840-x-le-40g",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "15.5\\(01.01.85\\)sy07"
          },
          {
            "model": "sg500-52mp",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "3.0.0.61"
          },
          {
            "model": "802.2",
            "scope": "lte",
            "trust": 1.0,
            "vendor": "ieee",
            "version": "802.2h-1997"
          },
          {
            "model": "sg500-28p",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "3.0.0.61"
          },
          {
            "model": "catalyst 6880-x",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "15.5\\(01.01.85\\)sy07"
          },
          {
            "model": "nexus 93240yc-fx2",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "catalyst 6506-e",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "15.5\\(01.01.85\\)sy07"
          },
          {
            "model": "n9k-x9564px",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "nexus 9508",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "n9k-c93600cd-gx",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "sg500x-48mpp",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "3.0.0.61"
          },
          {
            "model": "ios xe",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "17.6.1"
          },
          {
            "model": "nexus 92348gc-x",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "nexus 9536pq",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "meraki ms390",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": null
          },
          {
            "model": "catalyst 6509-neb-a",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "15.5\\(01.01.85\\)sy07"
          },
          {
            "model": "catalyst 6509-e",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "15.5\\(01.01.85\\)sy07"
          },
          {
            "model": "n9k-x9732c-fx",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "meraki ms425",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": null
          },
          {
            "model": "nexus 9236c",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "nexus 9504",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "nexus 93120tx",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "nexus 9364c",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "n9k-x9464tx2",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "n9k-x9732c-ex",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "meraki ms410",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": null
          },
          {
            "model": "nexus 93216tc-fx2",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "n9k-c9364d-gx2a",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "ios xe",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "15.2\\(07\\)e03"
          },
          {
            "model": "ios xe",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "15.2\\(07\\)e02"
          },
          {
            "model": "meraki ms210",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": null
          },
          {
            "model": "nexus 93180yc-fx",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "nexus 92304qc",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "catalyst 6513-e",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "15.5\\(01.01.85\\)sy07"
          },
          {
            "model": "catalyst c6824-x-le-40g",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "15.5\\(01.01.85\\)sy07"
          },
          {
            "model": "catalyst c6832-x-le",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "15.5\\(01.01.85\\)sy07"
          },
          {
            "model": "sg500-52p",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "3.0.0.61"
          },
          {
            "model": "nexus 92300yc",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "nexus 93360yc-fx2",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "nexus 93180yc-fx3",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "nexus 9348gc-fxp",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "sf500-24p",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "3.0.0.61"
          },
          {
            "model": "n9k-c9316d-gx",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "nexus 9272q",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "catalyst 6800ia",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "15.5\\(01.01.85\\)sy07"
          },
          {
            "model": "catalyst 6840-x",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "15.5\\(01.01.85\\)sy07"
          },
          {
            "model": "nexus 9800",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "sg500-52",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "3.0.0.61"
          },
          {
            "model": "catalyst 6504-e",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "15.5\\(01.01.85\\)sy07"
          },
          {
            "model": "nexus 93180yc-ex",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "sg500x-24p",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "3.0.0.61"
          },
          {
            "model": "sg500x-24",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "3.0.0.61"
          },
          {
            "model": "n9k-x9564tx",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "sf500-24",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "3.0.0.61"
          },
          {
            "model": "n9k-x9432c-s",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "ios xe",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "17.3.3"
          },
          {
            "model": "n9k-x9736c-fx",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "n9k-c9332d-gx2b",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "p802.1q",
            "scope": "lte",
            "trust": 1.0,
            "vendor": "ietf",
            "version": "d1.0"
          },
          {
            "model": "catalyst 6807-xl",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "15.5\\(01.01.85\\)sy07"
          },
          {
            "model": "nexus 9432pq",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "nexus 9336c-fx2",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "nexus 9332c",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "meraki ms355",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": null
          },
          {
            "model": "catalyst c6816-x-le",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "15.5\\(01.01.85\\)sy07"
          },
          {
            "model": "n9k-x97160yc-ex",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": "9.3\\(5\\)"
          },
          {
            "model": "meraki ms225",
            "scope": "eq",
            "trust": 1.0,
            "vendor": "cisco",
            "version": null
          },
          {
            "model": "cisco ios xe",
            "scope": null,
            "trust": 0.8,
            "vendor": "\u30b7\u30b9\u30b3\u30b7\u30b9\u30c6\u30e0\u30ba",
            "version": null
          },
          {
            "model": "802.2",
            "scope": null,
            "trust": 0.8,
            "vendor": "ieee",
            "version": null
          },
          {
            "model": "catalyst 6509-e",
            "scope": null,
            "trust": 0.8,
            "vendor": "\u30b7\u30b9\u30b3\u30b7\u30b9\u30c6\u30e0\u30ba",
            "version": null
          },
          {
            "model": "catalyst 6840-x",
            "scope": null,
            "trust": 0.8,
            "vendor": "\u30b7\u30b9\u30b3\u30b7\u30b9\u30c6\u30e0\u30ba",
            "version": null
          },
          {
            "model": "catalyst 6509-neb-a",
            "scope": null,
            "trust": 0.8,
            "vendor": "\u30b7\u30b9\u30b3\u30b7\u30b9\u30c6\u30e0\u30ba",
            "version": null
          },
          {
            "model": "catalyst 6506-e",
            "scope": null,
            "trust": 0.8,
            "vendor": "\u30b7\u30b9\u30b3\u30b7\u30b9\u30c6\u30e0\u30ba",
            "version": null
          },
          {
            "model": "catalyst c6816-x-le",
            "scope": null,
            "trust": 0.8,
            "vendor": "\u30b7\u30b9\u30b3\u30b7\u30b9\u30c6\u30e0\u30ba",
            "version": null
          },
          {
            "model": "ios xe",
            "scope": null,
            "trust": 0.8,
            "vendor": "\u30b7\u30b9\u30b3\u30b7\u30b9\u30c6\u30e0\u30ba",
            "version": null
          },
          {
            "model": "catalyst c6824-x-le-40g",
            "scope": null,
            "trust": 0.8,
            "vendor": "\u30b7\u30b9\u30b3\u30b7\u30b9\u30c6\u30e0\u30ba",
            "version": null
          },
          {
            "model": "catalyst 6509-v-e",
            "scope": null,
            "trust": 0.8,
            "vendor": "\u30b7\u30b9\u30b3\u30b7\u30b9\u30c6\u30e0\u30ba",
            "version": null
          },
          {
            "model": "p802.1q",
            "scope": null,
            "trust": 0.8,
            "vendor": "\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u6280\u8853\u30bf\u30b9\u30af\u30d5\u30a9\u30fc\u30b9 ietf",
            "version": null
          },
          {
            "model": "catalyst 6880-x",
            "scope": null,
            "trust": 0.8,
            "vendor": "\u30b7\u30b9\u30b3\u30b7\u30b9\u30c6\u30e0\u30ba",
            "version": null
          },
          {
            "model": "catalyst 6807-xl",
            "scope": null,
            "trust": 0.8,
            "vendor": "\u30b7\u30b9\u30b3\u30b7\u30b9\u30c6\u30e0\u30ba",
            "version": null
          },
          {
            "model": "catalyst c6832-x-le",
            "scope": null,
            "trust": 0.8,
            "vendor": "\u30b7\u30b9\u30b3\u30b7\u30b9\u30c6\u30e0\u30ba",
            "version": null
          },
          {
            "model": "catalyst 6800ia",
            "scope": null,
            "trust": 0.8,
            "vendor": "\u30b7\u30b9\u30b3\u30b7\u30b9\u30c6\u30e0\u30ba",
            "version": null
          },
          {
            "model": "catalyst c6840-x-le-40g",
            "scope": null,
            "trust": 0.8,
            "vendor": "\u30b7\u30b9\u30b3\u30b7\u30b9\u30c6\u30e0\u30ba",
            "version": null
          },
          {
            "model": "catalyst 6503-e",
            "scope": null,
            "trust": 0.8,
            "vendor": "\u30b7\u30b9\u30b3\u30b7\u30b9\u30c6\u30e0\u30ba",
            "version": null
          },
          {
            "model": "catalyst 6504-e",
            "scope": null,
            "trust": 0.8,
            "vendor": "\u30b7\u30b9\u30b3\u30b7\u30b9\u30c6\u30e0\u30ba",
            "version": null
          },
          {
            "model": "catalyst 6513-e",
            "scope": null,
            "trust": 0.8,
            "vendor": "\u30b7\u30b9\u30b3\u30b7\u30b9\u30c6\u30e0\u30ba",
            "version": null
          }
        ],
        "sources": [
          {
            "db": "JVNDB",
            "id": "JVNDB-2021-020376"
          },
          {
            "db": "NVD",
            "id": "CVE-2021-27853"
          }
        ]
      },
      "credits": {
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/credits#",
          "sources": {
            "@container": "@list",
            "@context": {
              "@vocab": "https://www.variotdbs.pl/ref/sources#"
            }
          }
        },
        "data": "This document was written by Timur Snoke.Statement Date:\u00a0\u00a0 September 27, 2022",
        "sources": [
          {
            "db": "CERT/CC",
            "id": "VU#855201"
          }
        ],
        "trust": 0.8
      },
      "cve": "CVE-2021-27853",
      "cvss": {
        "@context": {
          "cvssV2": {
            "@container": "@list",
            "@context": {
              "@vocab": "https://www.variotdbs.pl/ref/cvss/cvssV2#"
            },
            "@id": "https://www.variotdbs.pl/ref/cvss/cvssV2"
          },
          "cvssV3": {
            "@container": "@list",
            "@context": {
              "@vocab": "https://www.variotdbs.pl/ref/cvss/cvssV3#"
            },
            "@id": "https://www.variotdbs.pl/ref/cvss/cvssV3/"
          },
          "severity": {
            "@container": "@list",
            "@context": {
              "@vocab": "https://www.variotdbs.pl/cvss/severity#"
            },
            "@id": "https://www.variotdbs.pl/ref/cvss/severity"
          },
          "sources": {
            "@container": "@list",
            "@context": {
              "@vocab": "https://www.variotdbs.pl/ref/sources#"
            },
            "@id": "https://www.variotdbs.pl/ref/sources"
          }
        },
        "data": [
          {
            "cvssV2": [],
            "cvssV3": [
              {
                "attackComplexity": "LOW",
                "attackVector": "ADJACENT",
                "author": "nvd@nist.gov",
                "availabilityImpact": "NONE",
                "baseScore": 4.7,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "exploitabilityScore": 2.8,
                "id": "CVE-2021-27853",
                "impactScore": 1.4,
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "trust": 2.0,
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
                "version": "3.1"
              },
              {
                "attackComplexity": "Low",
                "attackVector": "Adjacent Network",
                "author": "NVD",
                "availabilityImpact": "None",
                "baseScore": 4.7,
                "baseSeverity": "Medium",
                "confidentialityImpact": "None",
                "exploitabilityScore": null,
                "id": "CVE-2021-27853",
                "impactScore": null,
                "integrityImpact": "Low",
                "privilegesRequired": "None",
                "scope": "Changed",
                "trust": 0.8,
                "userInteraction": "None",
                "vectorString": "CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
                "version": "3.0"
              }
            ],
            "severity": [
              {
                "author": "nvd@nist.gov",
                "id": "CVE-2021-27853",
                "trust": 1.0,
                "value": "MEDIUM"
              },
              {
                "author": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                "id": "CVE-2021-27853",
                "trust": 1.0,
                "value": "MEDIUM"
              },
              {
                "author": "NVD",
                "id": "CVE-2021-27853",
                "trust": 0.8,
                "value": "Medium"
              },
              {
                "author": "CNNVD",
                "id": "CNNVD-202209-2794",
                "trust": 0.6,
                "value": "MEDIUM"
              }
            ]
          }
        ],
        "sources": [
          {
            "db": "CNNVD",
            "id": "CNNVD-202209-2794"
          },
          {
            "db": "JVNDB",
            "id": "JVNDB-2021-020376"
          },
          {
            "db": "NVD",
            "id": "CVE-2021-27853"
          },
          {
            "db": "NVD",
            "id": "CVE-2021-27853"
          }
        ]
      },
      "description": {
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/description#",
          "sources": {
            "@container": "@list",
            "@context": {
              "@vocab": "https://www.variotdbs.pl/ref/sources#"
            }
          }
        },
        "data": "Layer 2 network filtering capabilities such as IPv6 RA guard or ARP inspection can be bypassed using combinations of VLAN 0 headers and LLC/SNAP headers. Layer-2 (L2) network security controls provided by various devices, such as switches, routers, and operating systems, can be bypassed by stacking Ethernet protocol headers. An attacker can send crafted packets through vulnerable devices to cause Denial-of-service (DoS) or to perform a man-in-the-middle (MitM) attack against a target network.CVE-2021-27853 Affected\nCVE-2021-27854 Affected\nCVE-2021-27861 Affected\nCVE-2021-27862 AffectedCVE-2021-27853 Affected\nCVE-2021-27854 Affected\nCVE-2021-27861 Affected\nCVE-2021-27862 Affected. IEEE of ieee 802.2 Products from multiple other vendors contain vulnerabilities related to authentication bypass through spoofing.Information may be tampered with",
        "sources": [
          {
            "db": "NVD",
            "id": "CVE-2021-27853"
          },
          {
            "db": "CERT/CC",
            "id": "VU#855201"
          },
          {
            "db": "JVNDB",
            "id": "JVNDB-2021-020376"
          },
          {
            "db": "VULMON",
            "id": "CVE-2021-27853"
          }
        ],
        "trust": 2.43
      },
      "external_ids": {
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/external_ids#",
          "data": {
            "@container": "@list"
          },
          "sources": {
            "@container": "@list",
            "@context": {
              "@vocab": "https://www.variotdbs.pl/ref/sources#"
            }
          }
        },
        "data": [
          {
            "db": "NVD",
            "id": "CVE-2021-27853",
            "trust": 4.1
          },
          {
            "db": "CERT/CC",
            "id": "VU#855201",
            "trust": 3.2
          },
          {
            "db": "JVNDB",
            "id": "JVNDB-2021-020376",
            "trust": 0.8
          },
          {
            "db": "AUSCERT",
            "id": "ESB-2022.4805",
            "trust": 0.6
          },
          {
            "db": "CNNVD",
            "id": "CNNVD-202209-2794",
            "trust": 0.6
          },
          {
            "db": "VULMON",
            "id": "CVE-2021-27853",
            "trust": 0.1
          }
        ],
        "sources": [
          {
            "db": "CERT/CC",
            "id": "VU#855201"
          },
          {
            "db": "VULMON",
            "id": "CVE-2021-27853"
          },
          {
            "db": "CNNVD",
            "id": "CNNVD-202209-2794"
          },
          {
            "db": "JVNDB",
            "id": "JVNDB-2021-020376"
          },
          {
            "db": "NVD",
            "id": "CVE-2021-27853"
          }
        ]
      },
      "id": "VAR-202209-1859",
      "iot": {
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/iot#",
          "sources": {
            "@container": "@list",
            "@context": {
              "@vocab": "https://www.variotdbs.pl/ref/sources#"
            }
          }
        },
        "data": true,
        "sources": [
          {
            "db": "VARIoT devices database",
            "id": null
          }
        ],
        "trust": 1.0
      },
      "last_update_date": "2025-11-18T15:12:14.158000Z",
      "patch": {
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/patch#",
          "data": {
            "@container": "@list"
          },
          "sources": {
            "@container": "@list",
            "@context": {
              "@vocab": "https://www.variotdbs.pl/ref/sources#"
            }
          }
        },
        "data": [
          {
            "title": "draft-ietf-v6ops-ra-guard-08 Cisco Systems Cisco\u00a0Security\u00a0Advisory",
            "trust": 0.8,
            "url": "https://standards.ieee.org/ieee/802.1Q/10323/"
          },
          {
            "title": "Multiple Cisco Product security vulnerabilities",
            "trust": 0.6,
            "url": "http://123.124.177.30/web/xxk/bdxqById.tag?id=209667"
          }
        ],
        "sources": [
          {
            "db": "CNNVD",
            "id": "CNNVD-202209-2794"
          },
          {
            "db": "JVNDB",
            "id": "JVNDB-2021-020376"
          }
        ]
      },
      "problemtype_data": {
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/problemtype_data#",
          "sources": {
            "@container": "@list",
            "@context": {
              "@vocab": "https://www.variotdbs.pl/ref/sources#"
            }
          }
        },
        "data": [
          {
            "problemtype": "CWE-290",
            "trust": 1.0
          },
          {
            "problemtype": "Avoid authentication by spoofing (CWE-290) [NVD evaluation ]",
            "trust": 0.8
          }
        ],
        "sources": [
          {
            "db": "JVNDB",
            "id": "JVNDB-2021-020376"
          },
          {
            "db": "NVD",
            "id": "CVE-2021-27853"
          }
        ]
      },
      "references": {
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/references#",
          "data": {
            "@container": "@list"
          },
          "sources": {
            "@container": "@list",
            "@context": {
              "@vocab": "https://www.variotdbs.pl/ref/sources#"
            }
          }
        },
        "data": [
          {
            "trust": 2.4,
            "url": "https://blog.champtar.fr/vlan0_llc_snap/"
          },
          {
            "trust": 2.4,
            "url": "https://kb.cert.org/vuls/id/855201"
          },
          {
            "trust": 1.7,
            "url": "https://standards.ieee.org/ieee/802.2/1048/"
          },
          {
            "trust": 1.7,
            "url": "https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/"
          },
          {
            "trust": 1.7,
            "url": "https://standards.ieee.org/ieee/802.1q/10323/"
          },
          {
            "trust": 1.7,
            "url": "https://tools.cisco.com/security/center/content/ciscosecurityadvisory/cisco-sa-vu855201-j3z8cktx"
          },
          {
            "trust": 1.0,
            "url": "https://www.kb.cert.org/vuls/id/855201"
          },
          {
            "trust": 0.8,
            "url": "https://jvn.jp/ta/jvnta96784241/"
          },
          {
            "trust": 0.8,
            "url": "https://nvd.nist.gov/vuln/detail/cve-2021-27853"
          },
          {
            "trust": 0.6,
            "url": "https://cxsecurity.com/cveshow/cve-2021-27853/"
          },
          {
            "trust": 0.6,
            "url": "https://www.auscert.org.au/bulletins/esb-2022.4805"
          },
          {
            "trust": 0.6,
            "url": "https://vigilance.fr/vulnerability/cisco-juniper-ingress-filtrering-bypass-via-layer-2-39380"
          },
          {
            "trust": 0.1,
            "url": "https://nvd.nist.gov"
          }
        ],
        "sources": [
          {
            "db": "VULMON",
            "id": "CVE-2021-27853"
          },
          {
            "db": "CNNVD",
            "id": "CNNVD-202209-2794"
          },
          {
            "db": "JVNDB",
            "id": "JVNDB-2021-020376"
          },
          {
            "db": "NVD",
            "id": "CVE-2021-27853"
          }
        ]
      },
      "sources": {
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/sources#",
          "data": {
            "@container": "@list"
          }
        },
        "data": [
          {
            "db": "CERT/CC",
            "id": "VU#855201"
          },
          {
            "db": "VULMON",
            "id": "CVE-2021-27853"
          },
          {
            "db": "CNNVD",
            "id": "CNNVD-202209-2794"
          },
          {
            "db": "JVNDB",
            "id": "JVNDB-2021-020376"
          },
          {
            "db": "NVD",
            "id": "CVE-2021-27853"
          }
        ]
      },
      "sources_release_date": {
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/sources_release_date#",
          "data": {
            "@container": "@list"
          }
        },
        "data": [
          {
            "date": "2022-09-27T00:00:00",
            "db": "CERT/CC",
            "id": "VU#855201"
          },
          {
            "date": "2022-09-27T00:00:00",
            "db": "VULMON",
            "id": "CVE-2021-27853"
          },
          {
            "date": "2022-09-27T00:00:00",
            "db": "CNNVD",
            "id": "CNNVD-202209-2794"
          },
          {
            "date": "2023-10-20T00:00:00",
            "db": "JVNDB",
            "id": "JVNDB-2021-020376"
          },
          {
            "date": "2022-09-27T18:15:09.527000",
            "db": "NVD",
            "id": "CVE-2021-27853"
          }
        ]
      },
      "sources_update_date": {
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/sources_update_date#",
          "data": {
            "@container": "@list"
          }
        },
        "data": [
          {
            "date": "2022-10-03T00:00:00",
            "db": "CERT/CC",
            "id": "VU#855201"
          },
          {
            "date": "2022-09-27T00:00:00",
            "db": "VULMON",
            "id": "CVE-2021-27853"
          },
          {
            "date": "2022-10-13T00:00:00",
            "db": "CNNVD",
            "id": "CNNVD-202209-2794"
          },
          {
            "date": "2023-10-20T06:17:00",
            "db": "JVNDB",
            "id": "JVNDB-2021-020376"
          },
          {
            "date": "2025-11-04T20:15:59.233000",
            "db": "NVD",
            "id": "CVE-2021-27853"
          }
        ]
      },
      "threat_type": {
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/threat_type#",
          "sources": {
            "@container": "@list",
            "@context": {
              "@vocab": "https://www.variotdbs.pl/ref/sources#"
            }
          }
        },
        "data": "remote or local",
        "sources": [
          {
            "db": "CNNVD",
            "id": "CNNVD-202209-2794"
          }
        ],
        "trust": 0.6
      },
      "title": {
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/title#",
          "sources": {
            "@container": "@list",
            "@context": {
              "@vocab": "https://www.variotdbs.pl/ref/sources#"
            }
          }
        },
        "data": "L2 network security controls can be bypassed using VLAN 0 stacking and/or 802.3 headers",
        "sources": [
          {
            "db": "CERT/CC",
            "id": "VU#855201"
          }
        ],
        "trust": 0.8
      },
      "type": {
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/type#",
          "sources": {
            "@container": "@list",
            "@context": {
              "@vocab": "https://www.variotdbs.pl/ref/sources#"
            }
          }
        },
        "data": "other",
        "sources": [
          {
            "db": "CNNVD",
            "id": "CNNVD-202209-2794"
          }
        ],
        "trust": 0.6
      }
    }