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Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass

Arista VeloCloud · CVE-2026-7473
1 news outlets0 CERTs and agencies0 researchers

What is it?

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.

Evidence

Security and tech press (1)

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
5.8
EPSS
0.6%
First seen
7 h ago
Status
confirmed

All Arista vulnerabilities