# CVE-2026-7473

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.

- Page: https://www.vulneraibility.com/cve/CVE-2026-7473
- CVSS: 5.8
- Known exploited: yes, in CISA KEV since 2026-06-09; CISA due date 2026-06-23
- EPSS: 1.11%
- Unvetted proof-of-concept code on GitHub: 1 GitHub proof of concept (first 2026-06-10)
- CISA SSVC: exploitation active, automatable yes, technical impact total (assessed 2026-06-10)
- Weakness: CWE-1023
- Published: 2026-06-05

## Affected versions

- Arista Networks EOS: affected 4.36.0; >= 4.35.0 and <= 4.35; >= 4.34.0 and <= 4.34; >= 4.33.0 and <= 4.33; >= 4.32.0 and <= 4.32; >= 4.31.0 and <= 4.31; <= 4.30

A version outside these ranges is not a statement that it is unaffected.

## References

- [advisory] https://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137
- [advisory] https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7473

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.