{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-73436",
        "assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
        "state": "PUBLISHED",
        "assignerShortName": "Arista",
        "dateReserved": "2026-08-12T16:39:35.976Z",
        "datePublished": "2026-09-16T09:19:47.800Z",
        "dateUpdated": "2026-09-16T10:13:39.211Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
                "shortName": "Arista",
                "dateUpdated": "2026-09-16T10:13:39.211Z"
            },
            "title": "Security Advisory 0171",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "On affected platforms running Arista EOS with OSPFv2 and OSPFv2 segment routing configured, a specially crafted OSPFv2 packet from an adjacent OSPF neighbor may cause OSPF to restart unexpectedly.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "<p>On affected platforms running Arista EOS with OSPFv2 and OSPFv2 segment routing configured, a specially crafted OSPFv2 packet from an adjacent OSPF neighbor may cause OSPF to restart unexpectedly.</p><p>These issues were discovered internally by Arista, and the company is not aware of any malicious uses of these issues in customer networks.</p>"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "Arista Networks",
                    "product": "EOS",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "4.36.0F",
                            "lessThanOrEqual": "4.36.1F",
                            "status": "affected",
                            "versionType": "custom"
                        },
                        {
                            "version": "4.35.0F",
                            "lessThanOrEqual": "4.35.5M",
                            "status": "affected",
                            "versionType": "custom"
                        },
                        {
                            "version": "4.34.0F",
                            "lessThanOrEqual": "4.34.7.1M",
                            "status": "affected",
                            "versionType": "custom"
                        },
                        {
                            "version": "4.33.0F",
                            "lessThanOrEqual": "4.33.9M",
                            "status": "affected",
                            "versionType": "custom"
                        },
                        {
                            "version": "1.0.0",
                            "lessThan": "4.33.0F",
                            "status": "affected",
                            "versionType": "custom"
                        }
                    ],
                    "platforms": [
                        "710 Series",
                        "720D Series",
                        "720XP/722XPM Series",
                        "750X Series",
                        "7010 Series",
                        "7010X Series",
                        "7020R/R4 Series",
                        "7130 Series running EOS",
                        "7150 Series",
                        "7160 Series",
                        "7170 Series",
                        "7050X/X2/X3/X4 Series",
                        "7060X/X2/X4/X5/X6 Series",
                        "7250X Series",
                        "7260X/X3 Series",
                        "7280R/R2/R3/R4 Series",
                        "7300X/X3 Series",
                        "7320X Series",
                        "7358X4 Series",
                        "7368X4 Series",
                        "7388X5 Series",
                        "7500R/R2/R3 Series",
                        "7800R3/R4 Series",
                        "7700R4 Series",
                        "AWE 5000 Series",
                        "AWE 7200R Series",
                        "CloudEOS",
                        "cEOS-lab",
                        "vEOS-lab",
                        "CloudVision eXchange, virtual or physical appliance"
                    ]
                }
            ],
            "configurations": [
                {
                    "lang": "en",
                    "value": "In order to be vulnerable to CVE-2026-73436, the following condition must be met:\n\nOSPFv2 segment routing must be configured. If the below command shows any OSPF instance, then the deployment is vulnerable.\n\n  switch>show ip ospf segment-routing\n  SPF Instance ID: 1\n  ...\n\nIf OSPFv2 segment routing is not configured, then there is no exposure to this issue.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "<p>In order to be vulnerable to CVE-2026-73436, the following condition must be met:</p><p>OSPFv2 segment routing must be configured. If the below command shows any OSPF instance, then the deployment is vulnerable.</p><pre>switch>show ip ospf segment-routing\nSPF Instance ID: 1\n...</pre><p>If OSPFv2 segment routing is not configured, then there is no exposure to this issue.</p>"
                        }
                    ]
                }
            ],
            "workarounds": [
                {
                    "lang": "en",
                    "value": "No mitigation is available for CVE-2026-73436.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "<p>No mitigation is available for CVE-2026-73436.</p>"
                        }
                    ]
                }
            ],
            "solutions": [
                {
                    "lang": "en",
                    "value": "The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below.\n\nCVE-2026-73436 has been fixed in the following releases:\n- 4.36.2F and later releases in the 4.36.x train\n- 4.35.6M and later releases in the 4.35.x train\n- 4.34.8M and later releases in the 4.34.x train\n- 4.33.10M and later releases in the 4.33.x train\n\nNo hotfix is available for CVE-2026-73436.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "<p>The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below.</p><p>CVE-2026-73436 has been fixed in the following releases:</p><ul><li>4.36.2F and later releases in the 4.36.x train</li><li>4.35.6M and later releases in the 4.35.x train</li><li>4.34.8M and later releases in the 4.34.x train</li><li>4.33.10M and later releases in the 4.33.x train</li></ul><p>No hotfix is available for CVE-2026-73436.</p>"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ],
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "baseScore": 6.5,
                        "baseSeverity": "MEDIUM"
                    }
                },
                {
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ],
                    "cvssV4_0": {
                        "version": "4.0",
                        "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                        "baseScore": 6,
                        "baseSeverity": "MEDIUM"
                    }
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "type": "CWE",
                            "lang": "en",
                            "cweId": "CWE-1284",
                            "description": "CWE-1284 Improper Validation of Specified Quantity in Input"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "type": "CWE",
                            "lang": "en",
                            "cweId": "CWE-125",
                            "description": "CWE-125 Out-of-bounds Read"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24727-security-advisory-0171",
                    "name": "Security Advisory 0171",
                    "tags": [
                        "vendor-advisory"
                    ]
                }
            ],
            "source": {
                "advisory": "Security Advisory 0171",
                "defects": [
                    "BUG 1843812"
                ],
                "discovery": "INTERNAL"
            }
        }
    }
}