CVE-2026-7473Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass
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.
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 6.9 | MEDIUM | 4.0Arista (CNA) | 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 |
| 5.8 | MEDIUM | 3.1Arista (CNA) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N |
CISA required action
⚡ Known exploited · remediation due Jun 23, 2026
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Details
- CVE ID
- CVE-2026-7473
- Status
- Analyzed
- Assigner (CNA)
- Arista
- Published
- Jun 5, 2026
- Last modified
- 2026-10-25 23:10 UTC
- Weaknesses
- CWE-1023 · Incomplete Comparison with Missing Factors
Affected Products
As published by the CNA in the CVE record.
Arista NetworksEOS7 version ranges
- 4.36.0
- 4.35.0 through 4.35
- 4.34.0 through 4.34
- 4.33.0 through 4.33
- 4.32.0 through 4.32
- 4.31.0 through 4.31
- through 4.30
References
- arista.com https://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137
- arista.com https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137
- cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7473