CVE-2020-26569: Arista Eos

Medium severity, CVSS 5.9. EPSS: 0.9% chance of exploitation in the next 30 days.

In EVPN VxLAN setups in Arista EOS, specific malformed packets can lead to incorrect MAC to IP bindings and as a result packets can be incorrectly forwarded across VLAN boundaries. This can result in traffic being discarded on the receiving VLAN. This affects versions: 4.21.12M and below releases in the 4.21.x train; 4.22.7M and below releases in the 4.22.x train; 4.23.5M and below releases in the 4.23.x train; 4.24.2F and below releases in the 4.24.x train.

Affected products

• Arista Eos: from 4.21.0f, up to and including 4.21.12m; from 4.22.0f, up to and including 4.22.7m; from 4.23.0f, up to and including 4.23.5m; from 4.24.0f, up to and including 4.24.2f

Published 2020-12-28. Last modified 2026-06-17.