CVE-2025-6188: Arista Networks Eos

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

On affected platforms running Arista EOS, maliciously formed UDP packets with source port 3503 may be accepted by EOS. UDP Port 3503 is associated with LspPing Echo Reply. This can result in unexpected behaviors, especially for UDP based services that do not perform some form of authentication.

Affected products

• Arista Networks Eos: from 4.33.0, up to and including 4.33.1F; from 4.33.1.0, up to and including 4.33.1.2F; from 4.32.4.0, up to and including 4.32.4.1M; from 4.31.0, up to and including 4.31.6M; from 4.30.0, up to and including 4.30.9.1M

Published 2025-08-25. Last modified 2026-06-17.