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

CISA Known Exploited Vulnerabilities

Name

Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability

Vendor

Arista

Product

Extensible Operating System

Added to the catalog

2026-06-09

Due date for US federal agencies

2026-06-23

Weaknesses

CWE-1023

Catalog version

2026.10.30

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 (CISA)

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Ransomware use: CISA does not mark known use of this vulnerability in ransomware campaigns.

Links in CISA's notes

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

Read on 2026-11-02T23:39:54.475Z under licence cisa-kev-cc0@b0067899 from https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

NVD analysis

Status

Analyzed

Published

2026-06-05T17:17:02.850

Last modified

2026-10-25T23:10:00.167

Weaknesses

CWE-1023

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.

References

• https://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137 (Broken Link)
• https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137 (Mitigation, Vendor Advisory)
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7473 (US Government Resource)

This product uses the NVD API but is not endorsed or certified by the NVD.

Read on 2026-11-02T23:42:31.494Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-7473

CVE record

Title (CNA)

Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass

Assigner

Arista

State

PUBLISHED

Published

2026-06-05T16:22:47.989Z

Updated

2026-10-07T18:27:31.678Z

Problem types

CWE-1023: Incomplete Comparison with Missing Factors

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.

References

• https://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137

Read on 2026-11-03T02:21:05.185Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/7xxx/CVE-2026-7473.json

Defensive techniques (MITRE D3FEND)

D3FEND maps these defensive techniques to the weakness (CWE) that NVD lists for this CVE, through the digital artifacts the weakness affects. D3FEND does not say they stop this vulnerability.

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