Arista · Extensible Operating System
CVE-2026-7473
Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass
What it is
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.
CISA: Arista Extensible Operating System (EOS) contains an incomplete comparison with missing factors vulnerability when the switch incorrectly decapsulate and forwards other unexpected tunneled packet with a destination IP matching its configured decapsulation IP.
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Deadline for US federal agencies: June 23, 2026
More exploited flaws from Arista
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Oct 23, 2026 | SQL Injection | VeloCloud Orchestrator | Critical 9.4 | 1.0% |
| Sep 22, 2026 | Improper Input Validation | VeloCloud Orchestrator | Critical 9.5 | 1.4% |
| Jul 27, 2026 | On-Prem OS Command Injection | VeloCloud Orchestrator | Critical 10.0 | 1.0% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.