CVE-2026-7473 — Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability

Overview

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.

Vulnerability details

CVE ID

CVE-2026-7473

Vulnerability

Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability

Vendor

Arista

Affected products

Arista: Extensible Operating System

Severity

HIGH

Exploitation status

Actively exploited in the wild (CISA KEV)

EPSS score

0.38% probability of exploitation in 30 days · 29th percentile

Published

2026-06-09

Remediation guidance

CVE-2026-7473 is in CISA's Known Exploited Vulnerabilities (KEV) catalog — U.S. federal civilian agencies are required to remediate it under Binding Operational Directive 22-01. Treat it as a priority for every environment.

Apply the vendor's official security update for Arista the affected product as soon as possible. Where a patch is unavailable, apply vendor mitigations or isolate/segment exposed systems.

FIRST EPSS estimates a 0.38% probability that CVE-2026-7473 will be exploited within the next 30 days (29th percentile of all CVEs) — useful for risk-based patch sequencing.

Hunt for indicators of compromise tied to this vulnerability and confirm logging/EDR coverage on affected assets.

Authoritative references

• NVD — National Vulnerability Database
• MITRE CVE Record
• CISA Known Exploited Vulnerabilities Catalog
• FIRST EPSS — Exploit Prediction Scoring