Description
On affected platforms running Arista EOS with IS-IS configured on a broadcast interface, an unauthenticated attacker can send a crafted IS-IS Hello Protocol Data Unit (PDU) that causes the device to tear down an established IS-IS adjacency. This may result in traffic disruption and loss of IP reachability for prefixes advertised through that adjacency.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Arista Networks | EOS | 4.36.0 – ≤ 4.36.1F, 4.35.0 – ≤ 4.35.5M, 4.34.0 – ≤ 4.34.7.1M, 4.33.0 – ≤ 4.33.9M, 4.32.0 – < 4.33.0F, 4.31.0 – < 4.32.0F | 4.33.0F |
Advisories 1
- WID-SEC-2026-3287 Arista EOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 16, 2026
References
- Security Advisory 0160 vendor-advisory