Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass_CVE-2026-7473

{
    "lastseen": "",
    "description": "On affected platforms running Arista EOS where a tunnel decapsulation configuration\u2014such as VXLAN (Virtual Extensible LAN), decap-groups, or a GRE (Generic Routing Encapsulation) tunnel interface\u2014is present, the switch will incorrectly decapsulate and forward other unexpected tunneled packet with a destination IP matching its configured decapsulation IP. This occurs because the switch does not verify the tunnel protocol type, potentially leading to the unexpected processing of non-configured tunnel traffic.\n\n\n\nThis issue has been reported as being exploited in the wild.",
    "published": "2026-06-05T16:22:47.989Z",
    "modified": "2026-06-05T16:22:47.989Z",
    "type": "cve",
    "title": "Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass",
    "source": "Arista",
    "references": "https://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137",
    "id": "CVE-2026-7473",
    "bulletinFamily": "",
    "cwe": [
        "CWE-1023"
    ],
    "cvelist": null,
    "sourceData": "Arista Networks EOS 4.36.0\nArista Networks EOS 4.35.0\nArista Networks EOS 4.34.0\nArista Networks EOS 4.33.0\nArista Networks EOS 4.32.0\nArista Networks EOS 4.31.0\nArista Networks EOS *",
    "sourceHref": "",
    "cvss": {
        "score": 5.8,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "EOS",
    "version": "4.36.0",
    "vendor": "Arista Networks",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}