{"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"}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "EOS", "vendor": "Arista Networks", "versions": [{"lessThan": "4.33.0F", "status": "affected", "version": "1.0.0", "versionType": "custom"}, {"lessThanOrEqual": "4.33.8M", "status": "affected", "version": "4.33.0F", "versionType": "custom"}, {"lessThanOrEqual": "4.34.6M", "status": "affected", "version": "4.34.0F", "versionType": "custom"}, {"lessThanOrEqual": "4.35.4M", "status": "affected", "version": "4.35.0F", "versionType": "custom"}, {"lessThanOrEqual": "4.36.0.1F", "status": "affected", "version": "4.36.0F", "versionType": "custom"}]}], "source": "psirt@arista.com"}], "cveTags": [], "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."}], "id": "CVE-2026-73455", "lastModified": "2026-09-16T10:16:52.243", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "psirt@arista.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.9, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "psirt@arista.com", "type": "Secondary"}]}, "published": "2026-09-16T10:16:52.243", "references": [{"source": "psirt@arista.com", "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24729-security-advisory-0173"}], "sourceIdentifier": "psirt@arista.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-130"}], "source": "psirt@arista.com", "type": "Secondary"}]}

{}

{}