{
  "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 177 canonical URL",
        "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24733-security-advisory-0177"
      }
    ],
    "title": "Security Advisory 177",
    "tracking": {
      "current_release_date": "2026-09-17T11:48:23Z",
      "generator": {
        "engine": {
          "name": "Arista Networks SecEng Service CSAF Generator"
        }
      },
      "id": "Arista Networks Security Advisory 177",
      "initial_release_date": "2026-09-17T11:48:23Z",
      "revision_history": [
        {
          "date": "2026-09-17T11:48:23Z",
          "number": "1",
          "summary": "Document created"
        }
      ],
      "status": "draft",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "product_version",
                    "name": "EOS version 4.35.6",
                    "product": {
                      "name": "EOS version 4.35.6",
                      "product_id": "CSAFPID-1"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.34.8",
                    "product": {
                      "name": "EOS version 4.34.8",
                      "product_id": "CSAFPID-2"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.36.2",
                    "product": {
                      "name": "EOS version 4.36.2",
                      "product_id": "CSAFPID-3"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.34.2",
                    "product": {
                      "name": "EOS version 4.34.2",
                      "product_id": "CSAFPID-0"
                    }
                  }
                ],
                "category": "product_name",
                "name": "EOS"
              }
            ],
            "category": "product_family",
            "name": "Software Products"
          }
        ],
        "category": "vendor",
        "name": "Arista Networks, Inc."
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-77190",
      "id": {
        "system_name": "Arista Bug ID",
        "text": "1852734"
      },
      "notes": [
        {
          "category": "description",
          "text": "On affected platforms running Arista EOS, an unauthenticated attacker who is network-adjacent to the switch and able to connect to a device with PIM Sparse Mode and MLAG configured, can send malformed messages that cause the Pimsm agent to terminate unexpectedly. The Pimsm agent is automatically restarted, but repeated attacks can cause the agent to restart continuously, resulting in a sustained denial of service.",
          "title": "CVE Description"
        },
        {
          "category": "other",
          "text": "In order to be vulnerable to CVE-2026-77190, the following conditions must be met:\n\n1. PIM Sparse Mode must be configured. This could be for IPv4 or IPv6. For example:\n\n2. MLAG must be configured and active.",
          "title": "1852734: Required Config for Exploitation"
        }
      ],
      "product_status": {
        "first_affected": [
          "CSAFPID-0"
        ],
        "fixed": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "MITRE",
          "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-77190"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.34.8",
          "product_ids": [
            "CSAFPID-2"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.35.6",
          "product_ids": [
            "CSAFPID-1"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.36.2",
          "product_ids": [
            "CSAFPID-3"
          ]
        },
        {
          "category": "none_available",
          "details": "Not fixed in EOS version 4.34.2",
          "product_ids": [
            "CSAFPID-0"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-0",
            "CSAFPID-2",
            "CSAFPID-3"
          ]
        }
      ],
      "title": "CVE-2026-77190"
    }
  ]
}