Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 09/06/2026. Patch affected systems as an emergency.
| Package | Affected versions | Patched versions |
|---|---|---|
| Extensible Operating System | Versions not published yet (product named by CISA KEV) | |
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.
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