CVE-2026-19640
Received Received - Intake

Authentication Bypass in Arista EOS via gNMI

Publication date: 2026-09-16

Last updated on: 2026-09-16

Assigner: Arista Networks, Inc.

Description
On affected platforms running Arista EOS, an authenticated user with access to the gNMI (gRPC Network Management Interface) may receive incorrect authorization results, potentially allowing access beyond their currently assigned permissions. This issue was discovered internally by Arista and the company is not aware of any malicious uses of this issue in customer networks.

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Meta Information

Published
2026-09-16
Last Modified
2026-09-16
Generated
2026-09-16
AI Q&A
2026-09-16
EPSS Evaluated
N/A
NVD
CVE-2026-19640
EUVD
EUVD-2026-80325

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
arista eos *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-863 The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

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Executive Summary

This vulnerability affects Arista EOS systems where an authenticated user with gNMI access may receive incorrect authorization results. This could allow them to access resources beyond their assigned permissions, potentially leading to unauthorized actions.

Impact Analysis

If exploited, this issue could let an attacker with valid credentials gain elevated access, potentially viewing or modifying network configurations they shouldn't have permission to access. This could disrupt network operations or lead to data breaches.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating compliance requirements like GDPR or HIPAA. It may result in data exposure, unauthorized modifications, or failure to maintain proper access controls, leading to regulatory penalties.

Mitigation Strategies

Review and verify user permissions for gNMI access on Arista EOS devices. Ensure authenticated users have correct authorization levels and restrict access to only necessary functions.

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