CVE WatchOct 7, 2026

CVE-2026-7473

Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability

CVSS

5.8

Medium

EPSS

0.6%

p50

KEV

YES

Jun 9, 2026

Exploit Today

0-100

Published: Jun 5, 2026 · Last modified: Oct 7, 2026 · CWE-1023

EPSS · 30d

0.6%EPSS · 30 days1.1%

2026-09-172026-10-15

KEV catalog record

Product

Arista / Extensible Operating System

Vulnerability

Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability

Added to KEV

Jun 9, 2026

Remediate by

Jun 23, 2026

Known ransomware use

Summary 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.

Notes

https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137 ; https://nvd.nist.gov/vuln/detail/CVE-2026-7473

Technical 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.

Official references

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