Description
On affected EOS platforms where 802.1x is configured in multi-host authenticated mode and the device is configured with Policy Based Routing (PBR), traffic from unauthenticated hosts may be forwarded to the destination configured in the PBR policies. This could potentially allow unauthenticated hosts access to networks. Additionally Layer 2 and Layer 3 control packets from unauthenticated hosts may get copied to the CPU.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Arista Networks | EOS | 4.34.0F ≤4.34.7M | — |
| Arista Networks | EOS | 4.36.0F ≤4.36.1F | — |
| Arista Networks | EOS | 4.35.0F ≤4.35.5M | — |
| Arista Networks | EOS | 4.33.0F ≤4.33.9M | — |
| Arista Networks | EOS | 1.0.0 <4.33.0F | — |
Advisories 1
- WID-SEC-2026-4509 Arista EOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 2026