CVE-2021-28500: Arista Eos

High severity, CVSS 7.8. EPSS: 0.8% chance of exploitation in the next 30 days.

An issue has recently been discovered in Arista EOS where the incorrect use of EOS's AAA API’s by the OpenConfig and TerminAttr agents could result in unrestricted access to the device for local users with nopassword configuration.

Affected products

• Arista Eos: before 4.20 (fixed in 4.20); from 4.21.0, up to and including 4.21.14m; from 4.22.0, up to and including 4.22.11m; from 4.23.0, up to and including 4.23.8m; from 4.24.6.0, up to and including 4.24.6m; from 4.25.0, up to and including 4.25.4m; …

Published 2022-01-14. Last modified 2026-06-17.