{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2026-120976","sourceIdentifier":"psirt@arista.com","published":"2026-11-10T20:18:52.660","lastModified":"2026-11-10T20:18:52.660","vulnStatus":"Received","cveTags":[],"descriptions":[{"lang":"en","value":"On affected platforms running Arista EOS with IEEE 802.1X authentication and MACsec using dynamically derived keys, sensitive authentication information may be recorded in diagnostic data during a Smart Switch Upgrade (SSU).\n\nAn attacker with administrative access on the device who obtains the affected diagnostic data could recover sensitive authentication information. This could potentially compromise the confidentiality and integrity of traffic protected by MACsec on the affected link.\n\nThe vulnerability is only exposed during and after an SSU reload where an active 802.1X session used for MACsec is present."}],"affected":[{"source":"psirt@arista.com","affectedData":[{"vendor":"Arista Networks","product":"EOS","defaultStatus":"unaffected","platforms":["7388-8D Series","7500R/R2 Series","7800/R3/R3A Series","722XPM and 720XPM Series","750X Series","7050X3/X4 Series","7170 Series","7289R3 Series","7500R3 Series","7800R4 Series"],"versions":[{"version":"4.22.0F","lessThan":"4.32.0F","versionType":"custom","status":"affected"},{"version":"4.32.0F","lessThan":"4.33.0F","versionType":"custom","status":"affected"},{"version":"4.33.0F","lessThanOrEqual":"4.33.9M","versionType":"custom","status":"affected"},{"version":"4.34.0F","lessThanOrEqual":"4.34.8M","versionType":"custom","status":"affected"},{"version":"4.35.0F","lessThanOrEqual":"4.35.6M","versionType":"custom","status":"affected"},{"version":"4.36.0F","lessThanOrEqual":"4.36.2F","versionType":"custom","status":"affected"}]}]}],"metrics":{"cvssMetricV40":[{"source":"psirt@arista.com","type":"Secondary","cvssData":{"version":"4.0","vectorString":"CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/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","baseScore":7.0,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"HIGH","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"cvssMetricV31":[{"source":"psirt@arista.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","baseScore":6.0,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":0.8,"impactScore":5.2}]},"weaknesses":[{"source":"psirt@arista.com","type":"Secondary","description":[{"lang":"en","value":"CWE-532"}]}],"references":[{"url":"https://www.arista.com/en/support/advisories-notices/security-advisory/25038-security-advisory-0216","source":"psirt@arista.com"}]}}