CVE-2026-73454: Arista Networks Eos

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

On affected platforms running Arista EOS with gRPC Network Security Interface (gNSI) Credentialz configured, a specially crafted request can cause unintended modifications to the target account's properties. This may result in the account being assigned elevated privileges or access beyond what an administrator intended.

Affected products

• Arista Networks Eos: from 4.30.0F, before 4.31.0F (fixed in 4.31.0F); from 4.31.0F, before 4.32.0F (fixed in 4.32.0F); from 4.32.0F, before 4.33.0F (fixed in 4.33.0F); from 4.33.0F, up to and including 4.33.8M; from 4.34.0F, up to and including 4.34.7M; from 4.35.0F, up to and including 4.35.5M; …

Published 2026-09-16. Last modified 2026-09-17.