CVE-2021-28496: Arista Eos

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

On systems running Arista EOS and CloudEOS with the affected release version, when using shared secret profiles the password configured for use by BiDirectional Forwarding Detection (BFD) will be leaked when displaying output over eAPI or other JSON outputs to other authenticated users on the device. The affected EOS Versions are: all releases in 4.22.x train, 4.23.9 and below releases in the 4.23.x train, 4.24.7 and below releases in the 4.24.x train, 4.25.4 and below releases in the 4.25.x train, 4.26.1 and below releases in the 4.26.x train

Affected products

• Arista Eos: from 4.22, up to and including 4.22.7m; from 4.23, before 4.23.10 (fixed in 4.23.10); from 4.24, before 4.24.8 (fixed in 4.24.8); from 4.25, before 4.25.5 (fixed in 4.25.5); from 4.26, before 4.26.2 (fixed in 4.26.2)

Published 2021-10-21. Last modified 2026-06-17.