{
  "document": {
    "category": "security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "publisher": {
      "category": "vendor",
      "contact_details": "support@arista.com",
      "name": "Arista PSIRT",
      "namespace": "https://www.arista.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "Security advisory 217 canonical URL",
        "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/25039-security-advisory-0217"
      }
    ],
    "title": "Security Advisory 217",
    "tracking": {
      "current_release_date": "2026-11-08T09:58:22Z",
      "generator": {
        "engine": {
          "name": "Arista Networks SecEng Service CSAF Generator"
        }
      },
      "id": "Arista Networks Security Advisory 217",
      "initial_release_date": "2026-11-08T09:58:22Z",
      "revision_history": [
        {
          "date": "2026-11-08T09:58:22Z",
          "number": "1",
          "summary": "Document created"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "product_version",
                    "name": "EOS version 4.33.10",
                    "product": {
                      "name": "EOS version 4.33.10",
                      "product_id": "CSAFPID-7"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.35.6",
                    "product": {
                      "name": "EOS version 4.35.6",
                      "product_id": "CSAFPID-8"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.36.3",
                    "product": {
                      "name": "EOS version 4.36.3",
                      "product_id": "CSAFPID-0"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.37.0",
                    "product": {
                      "name": "EOS version 4.37.0",
                      "product_id": "CSAFPID-2"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.34.8",
                    "product": {
                      "name": "EOS version 4.34.8",
                      "product_id": "CSAFPID-9"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.31.2",
                    "product": {
                      "name": "EOS version 4.31.2",
                      "product_id": "CSAFPID-6"
                    }
                  }
                ],
                "category": "product_name",
                "name": "EOS"
              }
            ],
            "category": "product_family",
            "name": "Software Products"
          }
        ],
        "category": "vendor",
        "name": "Arista Networks, Inc."
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-120977",
      "id": {
        "system_name": "Arista Bug ID",
        "text": "1899366"
      },
      "notes": [
        {
          "category": "description",
          "text": "On affected platforms running Arista EOS with 802.1X with Dynamic Host Configuration Protocol (DHCP) device profiling enabled, a network-adjacent attacker can send a crafted DHCP packet to force the device to record a spoofed device profile. This may potentially allow the authenticated supplicant to acquire unauthorized access to a network segment with elevated privileges.",
          "title": "CVE Description"
        },
        {
          "category": "other",
          "text": "In order to be vulnerable to CVE-2026-120977, the following condition must be met:\n\n* 802.1X global system authentication control is configured\n* at least one interface is configured as the 802.1X authenticator\n* at least one DHCP profiling option is configured\n* 802.1X RADIUS accounting is enabled\n\nA supplicant vulnerable to this may be EAPOL or MBA. A sample configuration is given below:\n\n```\nswitch#show running-config\naaa accounting dot1x default start-stop group radius\n\n\ndot1x\n   ! DHCP snooping must be enabled for DHCP profiling to operate.\n   ! Any one of the following DHCP profiling options is sufficient;\n   ! enabling all three is not required.\n   radius av-pair dhcp hostname\n   radius av-pair dhcp parameter-request-list\n   radius av-pair dhcp vendor-class-id\n\n\ninterface Ethernet5\n   switchport mode trunk\n   spanning-tree portfast edge\n   dot1x pae authenticator\n   dot1x port-control auto\ndot1x system-auth-control\n```",
          "title": "1899366: Required Config for Exploitation"
        }
      ],
      "product_status": {
        "first_affected": [
          "CSAFPID-6"
        ],
        "fixed": [
          "CSAFPID-0",
          "CSAFPID-2",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "MITRE",
          "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-120977"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.33.10",
          "product_ids": [
            "CSAFPID-7"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.34.8",
          "product_ids": [
            "CSAFPID-9"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.35.6",
          "product_ids": [
            "CSAFPID-8"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.36.3",
          "product_ids": [
            "CSAFPID-0"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.37.0",
          "product_ids": [
            "CSAFPID-2"
          ]
        },
        {
          "category": "none_available",
          "details": "Not fixed in EOS version 4.31.2",
          "product_ids": [
            "CSAFPID-6"
          ]
        },
        {
          "category": "mitigation",
          "details": "There is no workaround to prevent this behaviour."
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0",
            "CSAFPID-6",
            "CSAFPID-8",
            "CSAFPID-9",
            "CSAFPID-2",
            "CSAFPID-7"
          ]
        }
      ],
      "title": "CVE-2026-120977"
    }
  ]
}