CVE-2021-28508: Arista Eos

Medium severity, CVSS 6.1. EPSS: 0.5% chance of exploitation in the next 30 days.

This advisory documents the impact of an internally found vulnerability in Arista EOS state streaming telemetry agent TerminAttr and OpenConfig transport protocols. The impact of this vulnerability is that, in certain conditions, TerminAttr might leak IPsec sensitive data in clear text in CVP to other authorized users, which could cause IPsec traffic to be decrypted or modified by other authorized users on the device.

Affected products

• Arista Eos: from 4.23, up to and including 4.23.11; from 4.24, before 4.24.10 (fixed in 4.24.10); from 4.25, before 4.25.8 (fixed in 4.25.8); from 4.26, before 4.26.6 (fixed in 4.26.6); from 4.27, before 4.27.2 (fixed in 4.27.2)
• Arista Terminattr: before 1.10.11 (fixed in 1.10.11); from 1.11.0, before 1.16.8 (fixed in 1.16.8); from 1.17.0, before 1.19.0 (fixed in 1.19.0)

Published 2022-05-26. Last modified 2026-06-17.