Security Advisory 0215

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-120983
StatePUBLISHED
AssignerArista
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-10 20:18:53 UTC
Updated2026-11-12 19:24:37 UTC
DescriptionOn affected EOS platforms where 802.1x is configured in multi-host authenticated mode and the device is configured with Policy Based Routing (PBR), traffic from unauthenticated hosts may be forwarded to the destination configured in the PBR policies. This could potentially allow unauthenticated hosts access to networks. Additionally Layer 2 and Layer 3 control packets from unauthenticated hosts may get copied to the CPU.

Risk And Classification

Primary CVSS: v4.0 6.1 MEDIUM from [email protected]

CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/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

Problem Types: CWE-284 | CWE-284 CWE-284 Improper Access Control

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary6.1MEDIUMCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/C...
4.0CNADECLARED6.1MEDIUMCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N
3.1[email protected]Secondary7.6HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
3.1CNADECLARED7.6HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

CVSS v4.0 Breakdown

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

CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/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
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Arista Networks EOS affected 1.0.0 4.33.0F custom 710 Series, 720D Series, 720XP/722XPM Series, 7010TX Series, 7320X Series, 7060X/X2/X4/X5/X6/XE7 Series, 7260X/X3 Series, 7300X/X3 Series, 7050X3/X4 Series, 750X Series, 7250 Series, 7358X4 Series, 7368X4 Series, 7388X5 Series
CNA Arista Networks EOS affected 4.33.0F 4.33.9M custom 710 Series, 720D Series, 720XP/722XPM Series, 7010TX Series, 7320X Series, 7060X/X2/X4/X5/X6/XE7 Series, 7260X/X3 Series, 7300X/X3 Series, 7050X3/X4 Series, 750X Series, 7250 Series, 7358X4 Series, 7368X4 Series, 7388X5 Series
CNA Arista Networks EOS affected 4.34.0F 4.34.7M custom 710 Series, 720D Series, 720XP/722XPM Series, 7010TX Series, 7320X Series, 7060X/X2/X4/X5/X6/XE7 Series, 7260X/X3 Series, 7300X/X3 Series, 7050X3/X4 Series, 750X Series, 7250 Series, 7358X4 Series, 7368X4 Series, 7388X5 Series
CNA Arista Networks EOS affected 4.35.0F 4.35.5M custom 710 Series, 720D Series, 720XP/722XPM Series, 7010TX Series, 7320X Series, 7060X/X2/X4/X5/X6/XE7 Series, 7260X/X3 Series, 7300X/X3 Series, 7050X3/X4 Series, 750X Series, 7250 Series, 7358X4 Series, 7368X4 Series, 7388X5 Series
CNA Arista Networks EOS affected 4.36.0F 4.36.1F custom 710 Series, 720D Series, 720XP/722XPM Series, 7010TX Series, 7320X Series, 7060X/X2/X4/X5/X6/XE7 Series, 7260X/X3 Series, 7300X/X3 Series, 7050X3/X4 Series, 750X Series, 7250 Series, 7358X4 Series, 7368X4 Series, 7388X5 Series

References

ReferenceSourceLinkTags
www.arista.com/en/support/advisories-notices/security-advisory/25037-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

Workarounds

CNA: ip access-list PermitAnyAcl counters per-entry 10 permit ip 20.1.1.0/24 any (Workaround: Configure the PBR policy with specific, trusted address ranges rather than broad match rules)

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