CVE-2026-120983

Security Advisory 0215

Published Nov 10, 2026 CVSS 4.0 · 6.1 Medium EPSS < 1% KEV · Not listed

Description

On 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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Arista Networks

EOS

unaffected

Version	Status	Constraints
`1.0.0`	affected	< 4.33.0F
`4.33.0F`	affected	≤ 4.33.9M
`4.34.0F`	affected	≤ 4.34.7M
`4.35.0F`	affected	≤ 4.35.5M
`4.36.0F`	affected	≤ 4.36.1F

No data.

Vendor Product Versions

Arista

Eos

Version	Status	Scheme	Platform
`[1.0.0,4.33.0F)`	affected	generic	['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']
`[4.33.0F,4.33.9M]`	affected	generic	['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']
`[4.34.0F,4.34.7M]`	affected	generic	['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']
`[4.35.0F,4.35.5M]`	affected	generic	['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']
`[4.36.0F,4.36.1F]`	affected	generic	['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']

Remediation

Vendor Workaround

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)

Tracking

Advisories

No advisories available

Metrics

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact Low

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.173% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://www.arista.com/en/support/advisories-notices/security-advisory/25037-security-advisory-0215

History

Nov 12, 2026 3:30 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Arista Arista eos
Vendors & Products		Arista Arista eos

Nov 10, 2026 8:15 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		On 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.
Title		Security Advisory 0215
Weaknesses		CWE-284
References		https://www.arista.com/en/support/advisories-notices/security-advisory/25037-security-advisory-0215
Metrics		cvssV3_1 `{'score': 7.6, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L'}` cvssV4_0 `{'score': 6.1, 'vector': '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'}`