# CVE-2026-7473: Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass

> CVE-2026-7473: Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass. CVSS 5.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2026-7473
Last updated: 2026-10-07T19:17:43Z

- Published: 2026-06-05 16:22 UTC · Updated: 2026-10-07 19:17 UTC · Assigner: Arista
- CVSS: 5.8 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
- EPSS: 1.1%, 66th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2026-06-09, federal due date 2026-06-23, ransomware use: Unknown
- CWE: CWE-1023

## 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.

## CISA 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.

## Affected vendors and products

- Arista Networks: EOS

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-7473)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-7473)
- [https://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137](https://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-7473 · Markdown: https://rewindex.com/cve/CVE-2026-7473.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-7473 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:14:52.104Z