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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2026-0301
Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability

Original Issue Date:June 11, 2026

Severity Rating: MEDIUM

Systems Affected

  • Arista EOS-based products: 
    • 7020R Series
    • 7280R/R2Series
    • 7500R/R2 Series
  • Limited exposure (IP-in-IPv6 and GUEv6) on:
    • 7280R3 Series
    • 7500R3 Series
    • 7800R3 Series

Software Affected

  • All releases in the 4.36.x train
  • All releases in the 4.35.x train
  • All releases in the 4.34.x train
  • All releases in the 4.33.x train
  • All releases in the 4.32.x train
  • All releases in the 4.31.x train
  • All releases in the 4.30.x train
  • All releases in trains older than 4.30.x
  • All releases in trains newer than 4.36.x

Overview

A vulnerability has been reported in Arista Extensible Operating System (EOS), which could be exploited to cause unexpected tunnel protocol decapsulation and forwarding bypass.

Target Audience:
All end-user organizations and individuals using Arista EOS.

Risk Assessment:
Critical risks for unauthorized traffic injection, integrity of the systems.
 
Impact Assessment:
Potential impact on integrity of the system.

Description

Arista Extensible Operating System (EOS) is a network operating system used on Arista switches and routers, providing advanced networking, automation, and virtualization capabilities for enterprise and data centre environments.

An Incomplete Comparison with Missing Factors vulnerability exists in Arista EOS because affected platforms do not verify the tunnel protocol type during tunnel decapsulation, potentially leading to unexpected processing of non-configured tunnel traffic.

Successful exploitation of this vulnerability could allow an unintended user to cause the switch with a tunnel decapsulation configuration¿such as VXLAN (Virtual Extensible LAN), decap-groups, or a GRE (Generic Routing Encapsulation) tunnel interface-to incorrectly decapsulate and forward unexpected tunnelled packets with a destination IP matching its configured decapsulation IP.

Note: CVE-2026-7473 is being exploited in the wild.

Solution

Apply appropriate updates as mentioned by the vendor:
https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137

Vendor Information

Arista
https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137

References

Arista
https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137

CVE Name
CVE-2026-7473

Disclaimer

The information provided herein is on "as is" basis, without warranty of any kind.

Contact Information

Email: info@cert-in.org.in
Phone: +91-11-22902657

Postal address

Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India

 
Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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