Medium · published June 5, 2026
CVSS calls it medium at 5.8. It is confirmed in active exploitation. It sits in the 50.4th percentile for exploit probability.
On affected platforms running Arista EOS where a tunnel decapsulation configuration—such as VXLAN (Virtual Extensible LAN), decap-groups, or a GRE (Generic Routing Encapsulation) tunnel interface—is present, the switch will incorrectly decapsulate and forward other unexpected tunneled packet with a destination IP matching its configured decapsulation IP. This occurs because the switch does not verify the tunnel protocol type, potentially leading to the unexpected processing of non-configured tunnel traffic.
This issue has been reported as being exploited in the wild.
| Product | Versions | Fixed in |
|---|---|---|
| arista/eos | all versions | — |