{"api_version":"1","generated_at":"2026-11-11T05:23:02+00:00","cve":"CVE-2026-121370","urls":{"html":"https://cve.report/CVE-2026-121370","api":"https://cve.report/api/cve/CVE-2026-121370.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-121370","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-121370"},"summary":{"title":"Security Advisory 0224","description":"On affected platforms running Arista EOS with Precision Time Protocol (PTP) configured, an unauthenticated attacker with network access to a PTP-enabled port can create a denial of service (DoS) condition by sending traffic to the system.","state":"PUBLISHED","assigner":"Arista","published_at":"2026-11-10 20:18:56","updated_at":"2026-11-10 22:18:25"},"problem_types":["CWE-770","CWE-770 CWE-770 Allocation of Resources Without Limits or 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Series"]}],"timeline":[],"solutions":[],"workarounds":[{"source":"CNA","title":"","value":"switch# platform trident Linecard* diag mod MMU_MAX_BUCKET_QLAYER 1 1 THD_SEL=0x4d REFRESH=0x28\nswitch# platform trident Linecard* diag mod MMU_MIN_BUCKET_QLAYER 1 1 THD_SEL=0x10 REFRESH=0x8\n\nNote: If PTP is currently enabled on any interfaces, disable it on those interfaces before running the mitigation commands, then re-enable it afterward.\n\nTo disable PTP on an interface:\nswitch(config-if)# no ptp enable\n\nNote: These settings are not persistent. They must be re-applied after any forwarding plane reset or line card replacement.","time":"","lang":"en"}],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-121370","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-11-10T21:23:15.251420Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-11-10T22:02:12.078Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unaffected","platforms":["750X Series"],"product":"EOS","vendor":"Arista Networks","versions":[{"lessThanOrEqual":"4.34.1F","status":"affected","version":"4.34.0F","versionType":"custom"},{"lessThanOrEqual":"4.33.8M","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":"4.31.0F","versionType":"custom"},{"lessThan":"4.31.0F","status":"affected","version":"4.30.0F","versionType":"custom"},{"lessThan":"4.30.0F","status":"affected","version":"4.29.2F","versionType":"custom"}]}],"configurations":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<pre>switch>show ptp\nPTP Mode: Boundary Clock\nPTP Profile: Default ( IEEE1588 )\nClock Identity: XX:XX:XX:XX:XX:XX:XX:XX\nGrandmaster Clock Identity: XX:XX:XX:XX:XX:XX:XX:XX\nNumber of slave ports: 0\nNumber of master ports: 1\nOffset From Master (nanoseconds): 0\nMean Path Delay (nanoseconds): 0\nSteps Removed: 0\nSkew (estimated local-to-master clock frequency ratio): 1.0\n   Interface       State        Transport    Delay  \n                                             Mechanism\n--------------- ------------ --------------- ---------\n   Et1             Master       ipv4         e2e</pre>"}],"value":"switch>show ptp\nPTP Mode: Boundary Clock\nPTP Profile: Default ( IEEE1588 )\nClock Identity: XX:XX:XX:XX:XX:XX:XX:XX\nGrandmaster Clock Identity: XX:XX:XX:XX:XX:XX:XX:XX\nNumber of slave ports: 0\nNumber of master ports: 1\nOffset From Master (nanoseconds): 0\nMean Path Delay (nanoseconds): 0\nSteps Removed: 0\nSkew (estimated local-to-master clock frequency ratio): 1.0\n   Interface       State        Transport    Delay  \n                                             Mechanism\n--------------- ------------ --------------- ---------\n   Et1             Master       ipv4         e2e"}],"descriptions":[{"lang":"en","value":"On affected platforms running Arista EOS with Precision Time Protocol (PTP) configured, an unauthenticated attacker with network access to a PTP-enabled port can create a denial of service (DoS) condition by sending traffic to the system."}],"impacts":[{"capecId":"CAPEC-130","descriptions":[{"lang":"en","value":"CAPEC-130 Excessive Allocation"}]}],"metrics":[{"cvssV3_1":{"baseScore":8.6,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","version":"3.1"}},{"cvssV4_0":{"baseScore":9.2,"baseSeverity":"CRITICAL","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-770","description":"CWE-770 Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-11-10T20:10:01.435Z","orgId":"c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7","shortName":"Arista"},"references":[{"tags":["vendor-advisory"],"url":"https://www.arista.com/en/support/advisories-notices/security-advisory/25046-security-advisory-0224"}],"source":{"advisory":"Security Advisory 0224","defects":["1860051"],"discovery":"INTERNAL"},"title":"Security Advisory 0224","workarounds":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<pre>switch# platform trident Linecard* diag mod MMU_MAX_BUCKET_QLAYER 1 1 THD_SEL=0x4d REFRESH=0x28\nswitch# platform trident Linecard* diag mod MMU_MIN_BUCKET_QLAYER 1 1 THD_SEL=0x10 REFRESH=0x8\n\nNote: If PTP is currently enabled on any interfaces, disable it on those interfaces before running the mitigation commands, then re-enable it afterward.\n\nTo disable PTP on an interface:\nswitch(config-if)# no ptp enable\n\nNote: These settings are not persistent. They must be re-applied after any forwarding plane reset or line card replacement.</pre>"}],"value":"switch# platform trident Linecard* diag mod MMU_MAX_BUCKET_QLAYER 1 1 THD_SEL=0x4d REFRESH=0x28\nswitch# platform trident Linecard* diag mod MMU_MIN_BUCKET_QLAYER 1 1 THD_SEL=0x10 REFRESH=0x8\n\nNote: If PTP is currently enabled on any interfaces, disable it on those interfaces before running the mitigation commands, then re-enable it afterward.\n\nTo disable PTP on an interface:\nswitch(config-if)# no ptp enable\n\nNote: These settings are not persistent. They must be re-applied after any forwarding plane reset or line card replacement."}]}},"cveMetadata":{"assignerOrgId":"c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7","assignerShortName":"Arista","cveId":"CVE-2026-121370","datePublished":"2026-11-10T20:10:01.435Z","dateReserved":"2026-11-03T11:27:14.150Z","dateUpdated":"2026-11-10T22:02:12.078Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-11-10 20:18:56","lastModifiedDate":"2026-11-10 22:18:25","problem_types":["CWE-770","CWE-770 CWE-770 Allocation of Resources Without Limits or Throttling"],"metrics":{"cvssMetricV40":[{"source":"psirt@arista.com","type":"Secondary","cvssData":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/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","baseScore":9.2,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"HIGH","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:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","baseScore":8.6,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":4}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-11-10T21:23:15.251420Z","id":"CVE-2026-121370","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"121370","Ordinal":"1","Title":"Security Advisory 0224","CVE":"CVE-2026-121370","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"121370","Ordinal":"1","NoteData":"On affected platforms running Arista EOS with Precision Time Protocol (PTP) configured, an unauthenticated attacker with network access to a PTP-enabled port can create a denial of service (DoS) condition by sending traffic to the system.","Type":"Description","Title":"Security Advisory 0224"}]}}}