CVE-2026-120979

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-120979", "assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7", "state": "PUBLISHED", "assignerShortName": "Arista", "dateReserved": "2026-11-03T05:14:06.127Z", "datePublished": "2026-11-10T20:09:53.082Z", "dateUpdated": "2026-11-10T20:09:53.082Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7", "shortName": "Arista", "dateUpdated": "2026-11-10T20:09:53.082Z"}, "title": "Security Advisory 0212", "descriptions": [{"lang": "en", "value": "This vulnerability affects customers using Arista Pathfinder for WAN path selection with Border Gateway Protocol-Link State (BGP-LS) configured for Dynamic Path Selection (DPS). On affected platforms running Arista EOS with BGP-LS configured for DPS, an attacker who has established an authenticated BGP-LS session with the device can send a specially crafted BGP packet to cause incorrect WAN path selection and disrupt traffic forwarding."}], "affected": [{"vendor": "Arista Networks", "product": "EOS", "defaultStatus": "unaffected", "versions": [{"version": "4.36.0F", "status": "affected", "versionType": "custom", "lessThanOrEqual": "4.36.2F"}, {"version": "4.35.0F", "status": "affected", "versionType": "custom", "lessThanOrEqual": "4.35.6M"}, {"version": "4.34.0F", "status": "affected", "versionType": "custom", "lessThanOrEqual": "4.34.8M"}, {"version": "4.33.0F", "status": "affected", "versionType": "custom", "lessThanOrEqual": "4.33.10M"}, {"version": "4.32.0F", "status": "affected", "versionType": "custom", "lessThan": "4.33.0F"}, {"version": "1.0.0", "status": "affected", "versionType": "custom", "lessThan": "4.32.0F"}], "platforms": ["AWE 5000 Series", "AWE 7200R Series", "CloudEOS"]}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH"}}, {"cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N", "baseScore": 6.1, "baseSeverity": "MEDIUM"}}], "references": [{"url": "https://www.arista.com/en/support/advisories-notices/security-advisory/25034-security-advisory-0212", "tags": ["vendor-advisory"]}], "source": {"defects": ["2059581"], "advisory": "Security Advisory 0212", "discovery": "INTERNAL"}, "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-1289", "description": "CWE-1289 Improper Validation of Unsafe Equivalence in Input"}]}], "configurations": [{"lang": "en", "value": "switch(config)#show bgp link-state summary\nBGP summary information for VRF default\nRouter identifier 0.0.0.1, local AS number 300\nNeighbor Status Codes: m - Under maintenance\n Neighbor V AS MsgRcvd MsgSent InQ OutQ Up/Down State NlriRcd NlriAcc NlriAdv\n 12.0.0.3 4 300 82 83 0 0 01:02:33 Estab 0 0 1\n\nswitch#show adaptive-virtual-topology path | section Role:\nRole: pathfinder", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<pre>switch(config)#show bgp link-state summary\nBGP summary information for VRF default\nRouter identifier 0.0.0.1, local AS number 300\nNeighbor Status Codes: m - Under maintenance\n Neighbor V AS MsgRcvd MsgSent InQ OutQ Up/Down State NlriRcd NlriAcc NlriAdv\n 12.0.0.3 4 300 82 83 0 0 01:02:33 Estab 0 0 1\n\nswitch#show adaptive-virtual-topology path | section Role:\nRole: pathfinder</pre>"}]}], "impacts": [{"capecId": "CAPEC-194", "descriptions": [{"lang": "en", "value": "CAPEC-194 Fake the Source of Data"}]}]}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "platforms": ["AWE 5000 Series", "AWE 7200R Series", "CloudEOS"], "product": "EOS", "vendor": "Arista Networks", "versions": [{"lessThanOrEqual": "4.36.2F", "status": "affected", "version": "4.36.0F", "versionType": "custom"}, {"lessThanOrEqual": "4.35.6M", "status": "affected", "version": "4.35.0F", "versionType": "custom"}, {"lessThanOrEqual": "4.34.8M", "status": "affected", "version": "4.34.0F", "versionType": "custom"}, {"lessThanOrEqual": "4.33.10M", "status": "affected", "version": "4.33.0F", "versionType": "custom"}, {"lessThan": "4.33.0F", "status": "affected", "version": "4.32.0F", "versionType": "custom"}, {"lessThan": "4.32.0F", "status": "affected", "version": "1.0.0", "versionType": "custom"}]}], "source": "psirt@arista.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "This vulnerability affects customers using Arista Pathfinder for WAN path selection with Border Gateway Protocol-Link State (BGP-LS) configured for Dynamic Path Selection (DPS). On affected platforms running Arista EOS with BGP-LS configured for DPS, an attacker who has established an authenticated BGP-LS session with the device can send a specially crafted BGP packet to cause incorrect WAN path selection and disrupt traffic forwarding."}], "id": "CVE-2026-120979", "lastModified": "2026-11-12T19:24:37.847", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "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": 6.1, "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": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/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": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "psirt@arista.com", "type": "Secondary"}]}, "published": "2026-11-10T20:18:53.073", "references": [{"source": "psirt@arista.com", "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/25034-security-advisory-0212"}], "sourceIdentifier": "psirt@arista.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1289"}], "source": "psirt@arista.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["awe_5000_series", "awe_7200r_series", "cloudeos"], "status": "affected", "versions": {"scheme": "generic", "value": "[4.36.0F,4.36.2F]"}}, {"platform": ["awe_5000_series", "awe_7200r_series", "cloudeos"], "status": "affected", "versions": {"scheme": "generic", "value": "[4.35.0F,4.35.6M]"}}, {"platform": ["awe_5000_series", "awe_7200r_series", "cloudeos"], "status": "affected", "versions": {"scheme": "generic", "value": "[4.34.0F,4.34.8M]"}}, {"platform": ["awe_5000_series", "awe_7200r_series", "cloudeos"], "status": "affected", "versions": {"scheme": "generic", "value": "[4.33.0F,4.33.10M]"}}, {"platform": ["awe_5000_series", "awe_7200r_series", "cloudeos"], "status": "affected", "versions": {"scheme": "generic", "value": "[4.32.0F,4.33.0F)"}}, {"platform": ["awe_5000_series", "awe_7200r_series", "cloudeos"], "status": "affected", "versions": {"scheme": "generic", "value": "[1.0.0,4.32.0F)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "EOS", "source": "cna", "vendor": "Arista Networks"}, "product": "eos", "vendor": "arista"}], "created": "2026-11-11T22:15:21.806523+00:00", "title": "Arista EOS BGP\u2011LS Dynamic Path Selection Traffic Disruption Vulnerability", "updated": "2026-11-13T09:45:18.750472+00:00", "vendors": ["arista", "arista$PRODUCT$eos"]}