What is CVE-2021-28496?

CVE-2021-28496 is a medium-severity vulnerability in Arista Eos, classified under Missing Encryption of Sensitive Data. CVSS score: 5.7/10. Published 2021-10-21.

How severe is CVE-2021-28496?

Medium severity. CVSS v3 base score is 5.7 out of 10.

Vulnerability in Arista Eos

CVE-2021-28496

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

Published 2021-10-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (34.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 34.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Arista Eos
Arista Networks Eos — versions EOS-4.22, EOS-4.23, EOS-4.24

Weakness classification (CWE)

References

www.arista.com/en/support/advisories-notices/security-advisories/13243-security… (Vendor Advisory)

Frequently asked questions

What is CVE-2021-28496?: CVE-2021-28496 is a medium-severity vulnerability in Arista Eos, classified under Missing Encryption of Sensitive Data. CVSS score: 5.7/10. Published 2021-10-21.
How severe is CVE-2021-28496?: Medium severity. CVSS v3 base score is 5.7 out of 10.