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

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Summary

CVECVE-2023-5502
StatePUBLISHED
AssignerArista
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-04 23:16:47 UTC
Updated2026-06-05 15:02:34 UTC
DescriptionOn 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.

Risk And Classification

Primary CVSS: v4.0 8.2 HIGH from [email protected]

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

EPSS: 0.000350000 probability, percentile 0.107870000 (date 2026-06-10)

Problem Types: CWE-287 | CWE-287 CWE-287 Improper Authentication

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8.2HIGHCVSS: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/C...
4.0CNACVSS8.2HIGHCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1CNACVSS5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
High
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Arista Networks EOS affected 4.31.0 4.31.0F custom 7020R Series, 7280R/R2 Series, 7500R/R2 Series, 7280E Series, 7500E Series
CNA Arista Networks EOS affected 4.30.0 4.30.4M custom 7020R Series, 7280R/R2 Series, 7500R/R2 Series, 7280E Series, 7500E Series
CNA Arista Networks EOS affected 4.29.0 4.29.6M custom 7020R Series, 7280R/R2 Series, 7500R/R2 Series, 7280E Series, 7500E Series
CNA Arista Networks EOS affected 4.28.0 4.28.8M custom 7020R Series, 7280R/R2 Series, 7500R/R2 Series, 7280E Series, 7500E Series
CNA Arista Networks EOS affected 4.27.0 4.27.11M custom 7020R Series, 7280R/R2 Series, 7500R/R2 Series, 7280E Series, 7500E Series
CNA Arista Networks EOS affected 4.26.0 4.26.11M custom 7020R Series, 7280R/R2 Series, 7500R/R2 Series, 7280E Series, 7500E Series
CNA Arista Networks EOS affected 4.25.0 4.25.11M custom 7020R Series, 7280R/R2 Series, 7500R/R2 Series, 7280E Series, 7500E Series
CNA Arista Networks EOS affected 4.24.0 4.24.11M custom 7020R Series, 7280R/R2 Series, 7500R/R2 Series, 7280E Series, 7500E Series

References

ReferenceSourceLinkTags
www.arista.com/en/support/advisories-notices/security-advisory/19462-securit... [email protected] www.arista.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below. For more information about upgrading see EOS User Manual: Upgrades and Downgrades https://www.arista.com/en/um-eos/eos-upgrades-and-downgrades CVE-2023-5502 has been fixed in the following releases: * 4.32.0F and later releases in the 4.32.x train * 4.31.3M and later releases in the 4.31.x train * 4.30.5M and later releases in the 4.30.x train * 4.29.7M and later releases in the 4.29.x train Note: Products 7280E and 7500E are EOL, and there are no released versions of EOS which fix the issue on those platforms.

Workarounds

CNA: Mitigation of this vulnerability requires disabling dot1x. Dot1x can be disabled globally using the following command: no dot1x system-auth-control

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