{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-121370",
"assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
"state": "PUBLISHED",
"assignerShortName": "Arista",
"dateReserved": "2026-11-03T11:27:14.150Z",
"datePublished": "2026-11-10T20:10:01.435Z",
"dateUpdated": "2026-11-10T22:02:12.078Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
"shortName": "Arista",
"dateUpdated": "2026-11-10T20:10:01.435Z"
},
"title": "Security Advisory 0224",
"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."
}
],
"affected": [
{
"vendor": "Arista Networks",
"product": "EOS",
"defaultStatus": "unaffected",
"versions": [
{
"version": "4.34.0F",
"status": "affected",
"versionType": "custom",
"lessThanOrEqual": "4.34.1F"
},
{
"version": "4.33.0F",
"status": "affected",
"versionType": "custom",
"lessThanOrEqual": "4.33.8M"
},
{
"version": "4.32.0F",
"status": "affected",
"versionType": "custom",
"lessThan": "4.33.0F"
},
{
"version": "4.31.0F",
"status": "affected",
"versionType": "custom",
"lessThan": "4.32.0F"
},
{
"version": "4.30.0F",
"status": "affected",
"versionType": "custom",
"lessThan": "4.31.0F"
},
{
"version": "4.29.2F",
"status": "affected",
"versionType": "custom",
"lessThan": "4.30.0F"
}
],
"platforms": [
"750X Series"
]
}
],
"metrics": [
{
"cvssV3_1": {
"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"
}
},
{
"cvssV4_0": {
"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",
"baseScore": 9.2,
"baseSeverity": "CRITICAL"
}
}
],
"references": [
{
"url": "https://www.arista.com/en/support/advisories-notices/security-advisory/25046-security-advisory-0224",
"tags": [
"vendor-advisory"
]
}
],
"source": {
"defects": [
"1860051"
],
"advisory": "Security Advisory 0224",
"discovery": "INTERNAL"
},
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"type": "CWE",
"cweId": "CWE-770",
"description": "CWE-770 Allocation of Resources Without Limits or Throttling"
}
]
}
],
"configurations": [
{
"lang": "en",
"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",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"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
"
}
]
}
],
"workarounds": [
{
"lang": "en",
"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.",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"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.
"
}
]
}
],
"impacts": [
{
"capecId": "CAPEC-130",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-130 Excessive Allocation"
}
]
}
]
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2026-121370",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2026-11-10T21:23:15.251420Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-11-10T22:02:12.078Z"
}
}
]
}
}