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PatchSiren cyber security CVE debrief

CVE-2023-5502 Arista Networks CVE debrief

CVE-2023-5502 is a HIGH severity vulnerability in Arista EOS with 802.1x authentication configured on access/trunk ports and routing enabled on the access VLAN. A malicious supplicant may bypass 802.1x authentication requirements. The vulnerability has a CVSS score of 8.2.

Vendor
Arista Networks
Product
EOS
CVSS
HIGH 8.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-04
Original CVE updated
2026-07-22
Advisory published
2026-06-04
Advisory updated
2026-07-22

Who should care

Users of Arista EOS with 802.1x authentication and routing enabled on access VLANs should be aware of this vulnerability.

Technical summary

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.

Defensive priority

HIGH

Recommended defensive actions

  • Review and apply patches from Arista as available.
  • Implement additional security measures to monitor and control access to affected systems.

Evidence notes

Vendor evidence suggests Arista as the affected vendor.

Sources and references

Verified primary and authoritative sources

  • CVE-2023-5502 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2023-5502

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2023-5502 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2023-5502

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://www.arista.com/en/support/advisories-notices/security-advisory/19462-security-advisory-0096

    [email protected]

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.