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.
Metrics
CVSS 3.1 5.8/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:NWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Arista Networks | EOS | 4.36.0; >= 4.35.0, <= 4.35; >= 4.34.0, <= 4.34; >= 4.33.0, <= 4.33; >= 4.32.0, <= 4.32; >= 4.31.0, <= 4.31; <= 4.30 |
References
- https://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137Broken Link
- https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137Mitigation, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7473US Government Resource
Timeline
- Published
- Jun 5, 2026
- Last modified
- Oct 25, 2026
- Added to CISA KEV
- Jun 9, 2026
- NVD status
- Analyzed