{
  "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 174 canonical URL",
        "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24730-security-advisory-0174"
      }
    ],
    "title": "Security Advisory 174",
    "tracking": {
      "current_release_date": "2026-09-17T11:48:22Z",
      "generator": {
        "engine": {
          "name": "Arista Networks SecEng Service CSAF Generator"
        }
      },
      "id": "Arista Networks Security Advisory 174",
      "initial_release_date": "2026-09-17T11:48:22Z",
      "revision_history": [
        {
          "date": "2026-09-17T11:48:22Z",
          "number": "1",
          "summary": "Document created"
        }
      ],
      "status": "interim",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "product_version",
                    "name": "EOS version 4.34.8",
                    "product": {
                      "name": "EOS version 4.34.8",
                      "product_id": "CSAFPID-1"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.36.2",
                    "product": {
                      "name": "EOS version 4.36.2",
                      "product_id": "CSAFPID-2"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.35.6",
                    "product": {
                      "name": "EOS version 4.35.6",
                      "product_id": "CSAFPID-0"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.29.2",
                    "product": {
                      "name": "EOS version 4.29.2",
                      "product_id": "CSAFPID-3"
                    }
                  }
                ],
                "category": "product_name",
                "name": "EOS"
              }
            ],
            "category": "product_family",
            "name": "Software Products"
          }
        ],
        "category": "vendor",
        "name": "Arista Networks, Inc."
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-73453",
      "id": {
        "system_name": "Arista Bug ID",
        "text": "1850014"
      },
      "notes": [
        {
          "category": "description",
          "text": "An unauthenticated P4Runtime (Programming Protocol-Independent Packet Processors Runtime) client can achieve arbitrary code execution under certain conditions on affected platforms running Arista EOS configured with P4Runtime. **P4Runtime is disabled by default in Arista EOS.** By crafting a malicious packet during the initiation of a P4Runtime session, an attacker can obtain complete administrative control over the compromised switch.",
          "title": "CVE Description"
        },
        {
          "category": "other",
          "text": "In order to be vulnerable to CVE-2026-73453, the following condition must be met:\n\np4-runTime must be configured in one of the following combinations. P4-runtime is not a feature which runs by default and must be explicitly enabled:\n\n1. Non TLS mode (p4-runtime is enabled with no ssl profile configured)\n\n2. TLS mode (p4-runtime is enabled and ssl profile is configured with no trusted certificates) \n\n3. mTLS mode(p4-runtime is enabled and ssl profile is configured with trusted certificates) + Accounting is enabled for p4-runtime service Or gNSI acctz is enabled + gNSI Authz is disabled \n\nIf P4Runtime is not configured there is no exposure to this issue and the message will look like:",
          "title": "1850014: Required Config for Exploitation"
        }
      ],
      "product_status": {
        "first_affected": [
          "CSAFPID-3"
        ],
        "fixed": [
          "CSAFPID-0",
          "CSAFPID-1",
          "CSAFPID-2"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "MITRE",
          "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-73453"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.34.8",
          "product_ids": [
            "CSAFPID-1"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.35.6",
          "product_ids": [
            "CSAFPID-0"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.36.2",
          "product_ids": [
            "CSAFPID-2"
          ]
        },
        {
          "category": "none_available",
          "details": "Not fixed in EOS version 4.29.2",
          "product_ids": [
            "CSAFPID-3"
          ]
        },
        {
          "category": "mitigation",
          "details": "To mitigate this issue, it is recommended to configure the p4-runtime service in mTLS mode (ssl profile with trust certificates). Additionally, enable gNSI Authz to facilitate RPC authorization via the client certificate SPIFFE-ID. Please note that enabling mTLS config will terminate all existing P4 client connections and may cause control plane disruption since packetI/O operations are impacted.\n\nBefore implementing this solution, the following pre-requisites must be met:\n\n1. Generate SPIFFE-ID client certificate signed by the server trusted CA and use it for establishing P4 client connection to the server.\n2. Define a json file with SPIFFE-ID based policies for Authz service and install it on the device using gNSI Authz.Rotate() rpc"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 10.0,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-3",
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-0"
          ]
        }
      ],
      "title": "CVE-2026-73453"
    }
  ]
}