Multi-Auth Bypass in Arista EOS 802.1X Mode

Publication date: 2026-06-04

Last updated on: 2026-06-05

Assigner: Arista Networks, Inc.

Description

In Arista’s EOS when in 802.1X mode, multi-auth unauthenticated hosts might be allowed access to a switch port if there exists an EAPOL capable device in the fallback VLAN.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-06-04

Last Modified

2026-06-05

Generated

2026-07-15

AI Q&A

2026-06-05

EPSS Evaluated

2026-07-14

NVD

CVE-2024-6858

EUVD

EUVD-2024-55610

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-1287	The product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type.

Attack-Flow Graph

Executive Summary

This vulnerability occurs in Arista's EOS when operating in 802.1X mode. It allows multi-auth unauthenticated hosts to potentially gain access to a switch port if there is an EAPOL capable device present in the fallback VLAN.

Impact Analysis

The vulnerability could allow unauthorized devices to access network switch ports, potentially leading to unauthorized network access and exposure of network resources.

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