{"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": "2026-09-16T13:50:22.868Z"}, "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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-16T13:50:10.659104Z", "id": "CVE-2026-73436", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-16T13:50:22.868Z"}}]}}

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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", "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>", "base64": false}]}], "references": [{"url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24727-security-advisory-0171", "name": "Security Advisory 0171", "tags": ["vendor-advisory"]}], "workarounds": [{"lang": "en", "value": "No mitigation is available for CVE-2026-73436.", "supportingMedia": [{"type": "text/html", "value": "<p>No mitigation is available for CVE-2026-73436.</p>", "base64": false}]}], "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", "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>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-1284", "description": "CWE-1284 Improper Validation of Specified Quantity in Input"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "CWE-125 Out-of-bounds Read"}]}], "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", "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. 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "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"], "product": "EOS", "vendor": "Arista Networks", "versions": [{"lessThanOrEqual": "4.36.1F", "status": "affected", "version": "4.36.0F", "versionType": "custom"}, {"lessThanOrEqual": "4.35.5M", "status": "affected", "version": "4.35.0F", "versionType": "custom"}, {"lessThanOrEqual": "4.34.7.1M", "status": "affected", "version": "4.34.0F", "versionType": "custom"}, {"lessThanOrEqual": "4.33.9M", "status": "affected", "version": "4.33.0F", "versionType": "custom"}, {"lessThan": "4.33.0F", "status": "affected", "version": "1.0.0", "versionType": "custom"}]}], "source": "psirt@arista.com"}], "cveTags": [], "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."}], "id": "CVE-2026-73436", "lastModified": "2026-09-16T19:08:50.420", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "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": "ADJACENT", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.0, "baseSeverity": "MEDIUM", "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": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "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/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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-73436", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-16T13:50:10.659104Z", "version": "2.0.3"}}]}, "published": "2026-09-16T10:16:51.550", "references": [{"source": "psirt@arista.com", "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24727-security-advisory-0171"}], "sourceIdentifier": "psirt@arista.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-1284"}], "source": "psirt@arista.com", "type": "Secondary"}]}

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