CVE-2026-7473

Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass

State: Published
Severity: 6.9 Medium
Published: Jun 5, 2026
Updated: Oct 7, 2026
Reserved: Apr 29, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N	Arista
3.1	5.8 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N	Arista

Weaknesses

CWE-1023 Incomplete Comparison with Missing Factors

Affected Products

Product	Versions
EOSArista Networks	4.36.0Affected 4.35.0 through 4.35Affected 4.34.0 through 4.34Affected 4.33.0 through 4.33Affected 4.32.0 through 4.32Affected 4.31.0 through 4.31Affected 4.30 and earlierAffected

References

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

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