Description
On affected platforms running Arista EOS with Bidirectional Forwarding Detection (BFD) configured to use keyed MD5 or keyed SHA1 authentication, an unauthenticated attacker with network adjacency (direct or multi-hop) to a BFD-enabled interface can send a specially crafted BFD packet resulting in a system reboot.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Arista Networks | EOS | 4.36.0F – ≤ 4.36.2F, 4.35.0F – ≤ 4.35.6M, 4.34.0F – ≤ 4.34.8M, 4.33.0F – ≤ 4.33.10M, 4.32.0F – < 4.33.0F, 1.0.0 – < 4.32.0F | 4.33.0F |
Advisories 1
- WID-SEC-2026-4509 Arista EOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 2026