CVE-2026-120976

Security Advisory 0216

Published Nov 10, 2026 CVSS 4.0 · 7 High EPSS < 1% KEV · Not listed

Description

On affected platforms running Arista EOS with IEEE 802.1X authentication and MACsec using dynamically derived keys, sensitive authentication information may be recorded in diagnostic data during a Smart Switch Upgrade (SSU).

An attacker with administrative access on the device who obtains the affected diagnostic data could recover sensitive authentication information. This could potentially compromise the confidentiality and integrity of traffic protected by MACsec on the affected link.

The vulnerability is only exposed during and after an SSU reload where an active 802.1X session used for MACsec is present.

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
`4.22.0F`	affected	< 4.32.0F
`4.32.0F`	affected	< 4.33.0F
`4.33.0F`	affected	≤ 4.33.9M
`4.34.0F`	affected	≤ 4.34.8M
`4.35.0F`	affected	≤ 4.35.6M
`4.36.0F`	affected	≤ 4.36.2F

No data.

Vendor Product Versions

Arista

Eos

Version	Status	Scheme	Platform
`[4.22.0F,4.32.0F)`	affected	generic	['7388-8d_series', '7500r/r2_series', '7800/r3/r3a_series', '722xpm_and_720xpm_series', '750x_series', '7050x3/x4_series', '7170_series', '7289r3_series', '7500r3_series', '7800r4_series']
`[4.32.0F,4.33.0F)`	affected	generic	['7388-8d_series', '7500r/r2_series', '7800/r3/r3a_series', '722xpm_and_720xpm_series', '750x_series', '7050x3/x4_series', '7170_series', '7289r3_series', '7500r3_series', '7800r4_series']
`[4.33.0F,4.33.9M]`	affected	generic	['7388-8d_series', '7500r/r2_series', '7800/r3/r3a_series', '722xpm_and_720xpm_series', '750x_series', '7050x3/x4_series', '7170_series', '7289r3_series', '7500r3_series', '7800r4_series']
`[4.34.0F,4.34.8M]`	affected	generic	['7388-8d_series', '7500r/r2_series', '7800/r3/r3a_series', '722xpm_and_720xpm_series', '750x_series', '7050x3/x4_series', '7170_series', '7289r3_series', '7500r3_series', '7800r4_series']
`[4.35.0F,4.35.6M]`	affected	generic	['7388-8d_series', '7500r/r2_series', '7800/r3/r3a_series', '722xpm_and_720xpm_series', '750x_series', '7050x3/x4_series', '7170_series', '7289r3_series', '7500r3_series', '7800r4_series']
`[4.36.0F,4.36.2F]`	affected	generic	['7388-8d_series', '7500r/r2_series', '7800/r3/r3a_series', '722xpm_and_720xpm_series', '750x_series', '7050x3/x4_series', '7170_series', '7289r3_series', '7500r3_series', '7800r4_series']

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required High

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.135% 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/25038-security-advisory-0216

History

Nov 12, 2026 5:30 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 platforms running Arista EOS with IEEE 802.1X authentication and MACsec using dynamically derived keys, sensitive authentication information may be recorded in diagnostic data during a Smart Switch Upgrade (SSU). An attacker with administrative access on the device who obtains the affected diagnostic data could recover sensitive authentication information. This could potentially compromise the confidentiality and integrity of traffic protected by MACsec on the affected link. The vulnerability is only exposed during and after an SSU reload where an active 802.1X session used for MACsec is present.
Title		Security Advisory 0216
Weaknesses		CWE-532
References		https://www.arista.com/en/support/advisories-notices/security-advisory/25038-security-advisory-0216
Metrics		cvssV3_1 `{'score': 6, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N'}` cvssV4_0 `{'score': 7, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}`