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Review reviewHigh

CVE-2023-5502

Arista Networks EOS

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.

CVSS
8.2
EPSS
0.32%
24.1% percentile
CISA KEV
Not listed
Published
2026.06.05
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.32%
Technical severityCVSS 8.2

Vulnerability overview

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.

Affected product and versions

Product
Arista Networks EOS
Affected versions
>= 4.31.0 <= 4.31.0F, >= 4.30.0 <= 4.30.4M, >= 4.29.0 <= 4.29.6M, >= 4.28.0 <= 4.28.8M, >= 4.27.0 <= 4.27.11M, >= 4.26.0 <= 4.26.11M, >= 4.25.0 <= 4.25.11M, >= 4.24.0 <= 4.24.11M
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Arista Networks EOS and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE
CWE-287
CVE-2023-5502 — Arista Networks EOS | SECUFOCUS NOW