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CVE-2024-6858— 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.

Quick assessment

Affected
Arista Networks EOS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Arista EOS是美国Arista公司的一个完全可编程的、高度模块化的、基于Linux的网络操作系统。 Arista EOS存在安全漏洞，该漏洞源于在802.1X模式下，如果回退VLAN中存在支持EAPOL的设备，多认证未认证主机可能被允许访问交换机端口。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1136 · Create Account

Affected Version Matrix 4

VendorProduct Version RangeStatus
Arista Networks EOS 4.31.0≤ 4.31.1F affected
4.30.0≤ 4.30.5M affected
4.29.0≤ 4.29.7M affected
4.28.10≤ 4.28.10.1M affected
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I. Basic Information for CVE-2024-6858

Vulnerability Information
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Vulnerability Title
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.
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1287
Source: CVE Program / CVE List V5
Vulnerability Title
Arista EOS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Arista EOS是美国Arista公司的一个完全可编程的、高度模块化的、基于Linux的网络操作系统。 Arista EOS存在安全漏洞，该漏洞源于在802.1X模式下，如果回退VLAN中存在支持EAPOL的设备，多认证未认证主机可能被允许访问交换机端口。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Arista Networks EOS 4.31.0 ~ 4.31.1F -

II. Public POCs for CVE-2024-6858

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III. Intelligence Information for CVE-2024-6858

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Vendor Advisories for CVE-2024-6858 (1)

Same Patch Batch · Arista Networks · 2026-06-04 · 6 CVEs total

CVE-2024-27892 9.6 CRITICAL On affected platforms running Arista EOS with OpenConfig configured, a gNMI Set request ca
CVE-2024-27890 9.6 CRITICAL On affected platforms running Arista EOS with OpenConfig configured, a gNMI Set request ca
CVE-2025-8873 7.5 HIGH Arista EOS Dataplane Denial of Service via Malformed IPsec Packet
CVE-2023-5502 5.9 MEDIUM On affected platforms running Arista EOS with 802.1x authentication configured on the acce
CVE-2024-27891 5.3 MEDIUM On affected platforms running Arista EOS with MACsec and egress ACLs configured on the sam

IV. Related Vulnerabilities

Same product: EOS
Same vendor: Arista Networks
Same weakness: CWE-1287

V. Comments for CVE-2024-6858

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