{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-73455",
        "assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
        "state": "PUBLISHED",
        "assignerShortName": "Arista",
        "dateReserved": "2026-08-12T16:45:03.510Z",
        "datePublished": "2026-09-16T09:46:15.888Z",
        "dateUpdated": "2026-09-16T09:46:15.888Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
                "shortName": "Arista",
                "dateUpdated": "2026-09-16T09:46:15.888Z"
            },
            "title": "Security Advisory 0173",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "On affected platforms running Arista EOS with Open Shortest Path First version 3 (OSPFv3) configured, a specially crafted packet can cause the OSPFv3 agent to restart unexpectedly.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "<p>On affected platforms running Arista EOS with Open Shortest Path First version 3 (OSPFv3) configured, a specially crafted packet can cause the OSPFv3 agent to restart unexpectedly.</p>"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "Arista Networks",
                    "product": "EOS",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "1.0.0",
                            "lessThan": "4.33.0F",
                            "status": "affected",
                            "versionType": "custom"
                        },
                        {
                            "version": "4.33.0F",
                            "lessThanOrEqual": "4.33.8M",
                            "status": "affected",
                            "versionType": "custom"
                        },
                        {
                            "version": "4.34.0F",
                            "lessThanOrEqual": "4.34.6M",
                            "status": "affected",
                            "versionType": "custom"
                        },
                        {
                            "version": "4.35.0F",
                            "lessThanOrEqual": "4.35.4M",
                            "status": "affected",
                            "versionType": "custom"
                        },
                        {
                            "version": "4.36.0F",
                            "lessThanOrEqual": "4.36.0.1F",
                            "status": "affected",
                            "versionType": "custom"
                        }
                    ]
                }
            ],
            "configurations": [
                {
                    "lang": "en",
                    "value": "The vulnerability is exploitable when OSPFv3 is configured with at least one active neighbor:\n\nswitch>show ospfv3\nRouting Process \"ospfv3\" with ID 192.0.2.0 and Instance 0 VRF default\nIt has 1 fully adjacent neighbors\n\nswitch>show ospfv3 neighbor\nNeighbor 192.0.3.0 VRF default priority is 1, state is Full",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "<p>The vulnerability is exploitable when OSPFv3 is configured with at least one active neighbor:</p>\n<pre>\nswitch&gt;show ospfv3\nRouting Process &quot;ospfv3&quot; with ID 192.0.2.0 and Instance 0 VRF default\nIt has 1 fully adjacent neighbors\n\nswitch&gt;show ospfv3 neighbor\nNeighbor 192.0.3.0 VRF default priority is 1, state is Full\n</pre>"
                        }
                    ]
                }
            ],
            "workarounds": [
                {
                    "lang": "en",
                    "value": "Configure OSPFv3 IPsec encryption to authenticate/encrypt OSPFv3 packets.\n\nPer-interface encryption:\n\nswitch(config)# interface <interface-name>\nswitch(config-if)# ospfv3 encryption ipsec spi <spi-value> esp aes-256-cbc sha1 passphrase <shared-passphrase>\n\nPer-area encryption:\n\nswitch(config)# router ospfv3\nswitch(config-router-ospfv3)# address-family ipv4\nswitch(config-router-ospfv3-af)# area <area-id> encryption ipsec spi <spi-value> esp aes-256-cbc sha1 passphrase <shared-passphrase>",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "<p>Configure OSPFv3 IPsec encryption to authenticate/encrypt OSPFv3 packets.</p>\n<p>Per-interface encryption:</p>\n<pre>\nswitch(config)# interface &lt;interface-name&gt;\nswitch(config-if)# ospfv3 encryption ipsec spi &lt;spi-value&gt; esp aes-256-cbc sha1 passphrase &lt;shared-passphrase&gt;\n</pre>\n<p>Per-area encryption:</p>\n<pre>\nswitch(config)# router ospfv3\nswitch(config-router-ospfv3)# address-family ipv4\nswitch(config-router-ospfv3-af)# area &lt;area-id&gt; encryption ipsec spi &lt;spi-value&gt; esp aes-256-cbc sha1 passphrase &lt;shared-passphrase&gt;\n</pre>"
                        }
                    ]
                }
            ],
            "solutions": [
                {
                    "lang": "en",
                    "value": "The following EOS releases contain the fix:\n- 4.33.9M and later in the 4.33.x train\n- 4.34.7M and later in the 4.34.x train\n- 4.35.5M and later in the 4.35.x train\n- 4.36.1F and later in the 4.36.x train\n\nA hotfix (version 1.0) is available for 4.36.0.1F, 4.35.4M, 4.34.6M, and 4.33.8M.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "<p>The following EOS releases contain the fix:</p>\n<ul>\n<li>4.33.9M and later in the 4.33.x train</li>\n<li>4.34.7M and later in the 4.34.x train</li>\n<li>4.35.5M and later in the 4.35.x train</li>\n<li>4.36.1F and later in the 4.36.x train</li>\n</ul>\n<p>A hotfix (version 1.0) is available for 4.36.0.1F, 4.35.4M, 4.34.6M, and 4.33.8M.</p>"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ],
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH"
                    }
                },
                {
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ],
                    "cvssV4_0": {
                        "version": "4.0",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H",
                        "baseScore": 8.9,
                        "baseSeverity": "HIGH"
                    }
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "type": "CWE",
                            "cweId": "CWE-130",
                            "description": "CWE-130 Improper Handling of Length Parameter Inconsistency"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24729-security-advisory-0173",
                    "tags": [
                        "vendor-advisory"
                    ]
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-231",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-231 Oversized Serialized Data Payloads"
                        }
                    ]
                }
            ],
            "source": {
                "advisory": "Security Advisory 0173",
                "discovery": "INTERNAL",
                "defects": [
                    "BUG1307559"
                ]
            },
            "datePublic": "2026-09-09T00:00:00.000Z"
        }
    }
}