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CVE-2023-5502— On affected platforms running Arista EOS with 802.1x authentication configured on the access/trunk ports, a malicious supplicant may bypass authentication.

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，该漏洞源于在配置802.1x认证的访问/中继端口上，且端口访问VLAN启用了路由功能时，恶意请求者可能绕过802.1x认证要求。

CVSS 5.9 · Medium EPSS 0.32% · P22

Possible ATT&CK Techniques 1 AI

T1562.001

Affected Version Matrix 8

VendorProduct Version RangeStatus
Arista Networks EOS 4.31.0≤ 4.31.0F affected
4.30.0≤ 4.30.4M affected
4.29.0≤ 4.29.6M affected
4.28.0≤ 4.28.8M affected
4.27.0≤ 4.27.11M affected
4.26.0≤ 4.26.11M affected
4.25.0≤ 4.25.11M affected
4.24.0≤ 4.24.11M affected
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I. Basic Information for CVE-2023-5502

Vulnerability Information
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Vulnerability Title
On affected platforms running Arista EOS with 802.1x authentication configured on the access/trunk ports, a malicious supplicant may bypass authentication.
Source: CVE Program / CVE List V5
Vulnerability Description
On affected platforms running Arista EOS with 802.1x authentication configured on the access/trunk ports, and routing enabled on the access VLAN of the ports, a malicious supplicant may be able to bypass the requirement to perform 802.1x authentication.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
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，该漏洞源于在配置802.1x认证的访问/中继端口上，且端口访问VLAN启用了路由功能时，恶意请求者可能绕过802.1x认证要求。
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 ~ 4.31.0F -

II. Public POCs for CVE-2023-5502

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III. Intelligence Information for CVE-2023-5502

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Vendor Advisories for CVE-2023-5502 (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-2024-27891 5.3 MEDIUM On affected platforms running Arista EOS with MACsec and egress ACLs configured on the sam
CVE-2024-6858 In Arista’s EOS when in 802.1X mode, multi-auth unauthenticated hosts might be allowed acc

IV. Related Vulnerabilities

Same product: EOS
Same vendor: Arista Networks
Same weakness: CWE-287

V. Comments for CVE-2023-5502

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