June 9, 2026 · Applied Cybernetics Group
CVE-2026-7473 — Arista Extensible Operating System
Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability
- Added to KEV
2026-06-09- Federal due date
2026-06-23- Vendor
- Arista
- Product
- Extensible Operating System
- EPSS
- 53.5th percentile (score 0.008, as of
2026-07-13) - NVD CVSS v3.1
- 5.8 (MEDIUM)
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2026-7473
CISA short description
Arista Extensible Operating System (EOS) contains an incomplete comparison with missing factors vulnerability when the switch incorrectly decapsulate and forwards other unexpected tunneled packet with a destination IP matching its configured decapsulation IP.
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.
NVD 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.