CVE-2026-7473: Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass
In CISA’s Known Exploited Vulnerabilities catalog: Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability.
Added , federal remediation due . Known ransomware use: Unknown.
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Description
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.
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N · CWE-1023
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
Arista Networks: EOS
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- www.arista.com/en/support/advisories-notices/security-advisory/22872-security-adviso… (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)