title: For certain systems running EOS, a Precision Time Protocol (PTP) packet of a management/signaling message with an invalid Type-Length-Value (TLV) causes the PTP agent to restart. Repeated restarts of the service will make the service unavailable.
description: For certain systems running EOS, a Precision Time Protocol (PTP) packet of a management/signaling message with an invalid Type-Length-Value (TLV) causes the PTP agent to restart. Repeated restarts of the service will make the service unavailable.
problem types: CWE-400 Uncontrolled Resource Consumption
affected:
{
vendor: Arista Networks
product: EOS
versions:
version: 4.22, status: affected
version: 4.27.1, status: affected, lessThanOrEqual: 4.27.0, versionType: custom
version: 4.26.4, status: affected, lessThanOrEqual: 4.26.0, versionType: custom
version: 4.25.6, status: affected, lessThanOrEqual: 4.25.0, versionType: custom
version: 4.24.8, status: affected, lessThanOrEqual: 4.24.0, versionType: custom
version: 4.23.10, status: affected, lessThanOrEqual: 4.23.0, versionType: custom
}
metrics:
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: LOW
baseScore: 5.3
baseSeverity: MEDIUM
]
solutions: The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Artista recommends customers move to the latest version of each release that contains all the fixes listed below.
CVE-2021-28510 has been fixed in the following releases:
4.27.2 and later releases in the 4.27.x train
4.26.5 and later releases in the 4.26.x train
4.25.7 and later releases in the 4.25.x train
4.24.9 and later releases in the 4.24.x train
4.23.11 and later releases in the 4.23.x train
workarounds: Install ACL rules to drop PTP packets from untrusted sources. Best practice is to block access to untrusted (non-management) networks.