CVE-2021-28496: In Arista's EOS software affected releases, the shared secret profiles sensitive configuration might be leaked when displaying output over eAPI or other JSON outputs to authenticated users on the device.

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-10-21 · updated 2026-06-17
Weakness: CWE-311

Description

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 Networks EOS: from 4.22 through 4.22.7m; from 4.23 before 4.23.10; from 4.24 before 4.24.8; from 4.25 before 4.25.5; from 4.26 before 4.26.2 — fixed in 4.23.10, 4.24.8, 4.25.5, 4.26.2

How to fix

Upgrade to a fixed version: Arista Networks EOS 4.23.10, 4.24.8, 4.25.5, 4.26.2. Check the vendor advisory for mitigations.

References

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