{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-73460", "assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7", "state": "PUBLISHED", "assignerShortName": "Arista", "dateReserved": "2026-08-12T16:45:03.511Z", "datePublished": "2026-09-15T23:20:43.813Z", "dateUpdated": "2026-09-15T23:20:43.813Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7", "shortName": "Arista", "dateUpdated": "2026-09-15T23:20:43.813Z"}, "title": "Security Advisory 0160", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-863", "description": "CWE-863: Incorrect Authorization", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-272", "descriptions": [{"lang": "en", "value": "CAPEC-272 Protocol Manipulation"}]}], "affected": [{"vendor": "Arista Networks", "product": "EOS", "versions": [{"status": "affected", "version": "4.36.0", "lessThanOrEqual": "4.36.1F", "versionType": "custom"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "On affected platforms running Arista EOS with IS-IS graceful restart enabled, an unauthenticated attacker who can inject a malformed IS-IS LSP PDU packet can cause the IS-IS graceful restart procedure to terminate prematurely. This may result in traffic loss following a restart event.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>On affected platforms running Arista EOS with IS-IS graceful restart enabled, an unauthenticated attacker who can inject a malformed IS-IS LSP PDU packet can cause the IS-IS graceful restart procedure to terminate prematurely. This may result in traffic loss following a restart event.</p>"}]}], "references": [{"url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24716-security-advisory-0160", "name": "Security Advisory 0160", "tags": ["vendor-advisory"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseSeverity": "MEDIUM", "baseScore": 6.1, "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "ADJACENT", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 7, "vectorString": "CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"}}], "configurations": [{"lang": "en", "value": "In order to be vulnerable to CVE-2026-73460, the following condition must be met: IS-IS graceful-restart should be enabled.\n\n\n\nswitch(config-router-isis)#show active\nrouter isis 1\n\u00a0\u00a0\u00a0net 49.0001.1111.1111.1001.00\n\u00a0\u00a0\u00a0graceful-restart\n\n\n\nswitch#show isis graceful-restart\nIS-IS Instance: 1 VRF: default\n\u00a0\u00a0System ID: 1111.1111.1001\n\u00a0\u00a0Graceful Restart: Enabled, Graceful Restart Helper: Enabled\n\u00a0\u00a0State: Graceful Restart disabled during startup\n\u00a0\u00a0T1 : 3s\n\u00a0\u00a0T2 (level-1) : 30s/not running\n\u00a0\u00a0T2 (level-2) : 30s/not running\n\u00a0\u00a0T3 : not running\n\u00a0\u00a0System ID\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Type\u00a0 \u00a0 Interface\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Restart Capable \u00a0 Status\u00a0\u00a0\u00a0\u00a0\n\u00a0\u00a01111.1111.1002 \u00a0 \u00a0 L1\u00a0 \u00a0 \u00a0 Ethernet1\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Yes \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Running\u00a0 \n\n\n\n\n\nIf IS-IS graceful-restart is not enabled, there is no exposure to this issue.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>In order to be vulnerable to CVE-2026-73460, the following condition must be met: IS-IS graceful-restart should be enabled.</p><pre>switch(config-router-isis)#show active\nrouter isis 1\n&nbsp;&nbsp;&nbsp;net 49.0001.1111.1111.1001.00\n&nbsp;&nbsp;&nbsp;graceful-restart<br><br><pre>switch#show isis graceful-restart\nIS-IS Instance: 1 VRF: default\n&nbsp;&nbsp;System ID: 1111.1111.1001\n&nbsp;&nbsp;Graceful Restart: Enabled, Graceful Restart Helper: Enabled\n&nbsp;&nbsp;State: Graceful Restart disabled during startup\n&nbsp;&nbsp;T1 : 3s\n&nbsp;&nbsp;T2 (level-1) : 30s/not running\n&nbsp;&nbsp;T2 (level-2) : 30s/not running\n&nbsp;&nbsp;T3 : not running\n&nbsp;&nbsp;System ID&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Type&nbsp; &nbsp; Interface&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Restart Capable &nbsp; Status&nbsp;&nbsp;&nbsp;&nbsp;\n&nbsp;&nbsp;1111.1111.1002 &nbsp; &nbsp; L1&nbsp; &nbsp; &nbsp; Ethernet1&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Yes &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Running&nbsp; </pre></pre><p>If IS-IS graceful-restart is not enabled, there is no exposure to this issue.</p>"}]}], "workarounds": [{"lang": "en", "value": "No workaround is available for this issue.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>No workaround is available for this issue.</p>"}]}], "solutions": [{"lang": "en", "value": "The recommended resolution is to upgrade to a fixed software version.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>The recommended resolution is to upgrade to a fixed software version.</p>"}]}], "credits": [{"lang": "en", "value": "This issue was discovered internally by Arista and the company is not aware of any malicious uses of these issues in customer networks.", "type": "finder"}], "source": {"advisory": "0160", "discovery": "UNKNOWN", "defects": ["BUG1840562"]}, "x_generator": {"engine": "Vulnogram 1.0.5"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "EOS", "vendor": "Arista Networks", "versions": [{"lessThanOrEqual": "4.36.1F", "status": "affected", "version": "4.36.0", "versionType": "custom"}]}], "source": "psirt@arista.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "On affected platforms running Arista EOS with IS-IS graceful restart enabled, an unauthenticated attacker who can inject a malformed IS-IS LSP PDU packet can cause the IS-IS graceful restart procedure to terminate prematurely. This may result in traffic loss following a restart event."}], "id": "CVE-2026-73460", "lastModified": "2026-09-16T00:17:05.397", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 4.0, "source": "psirt@arista.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "ADJACENT", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.0, "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:A/AC:H/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": "2026-09-16T00:17:05.397", "references": [{"source": "psirt@arista.com", "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24716-security-advisory-0160"}], "sourceIdentifier": "psirt@arista.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-863"}], "source": "psirt@arista.com", "type": "Secondary"}]}

{}

{}