CVE-2026-102069: Junos OS: An ICCP peer causes dot1xd to crash when dot1x synchronization is enabled

Published Oct 14, 2026

Updated

A Stack-based Buffer Overflow vulnerability in the dot1x daemon of Juniper Networks Junos OS devices operating as Junos Fusion Aggregation Devices allows an adjacent attacker acting as the configured ICCP peer to cause a denial of service and potentially execute code as root via. The issue is triggered when dot1x synchronization is enabled for the required Fusion satellite topology.

Affected Software

1 affected component

Juniper Networks Junos OS

Remediation

Recommended actions to resolve this vulnerability, in priority order.

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Fixed in 23.2R2-S7.7-EVO
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Fixed in 23.4R2-S8.11-EVO
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Fixed in 24.2R2-S5.6-EVO
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Fixed in 24.4R2-S5-EVO
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Fixed in 25.2R2-S2-EVO
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Fixed in 25.2X100-D35-EVO
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Fixed in 25.4R1-S3-EVO
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Fixed in 25.4R2-EVO
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Fixed in 25.4X300-D40-EVO
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Fixed in 26.2R1-S2-EVO
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Fixed in 26.2R2-EVO
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Fixed in 26.4R1-EVO
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Fixed in 23.2R2-S7.7
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Fixed in 23.4R2-S8.13
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Fixed in 24.2R2-S5.5
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Fixed in 24.4R2-S5
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Fixed in 25.2R2-S2
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Fixed in 25.4R1-S3
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Fixed in 25.4R2
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Fixed in 26.2R1-S2
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Fixed in 26.2R2
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Fixed in 26.4R1

Event History

Oct 14, 2026

CVE Published

via MITRE·04:17 PM

Data Sourced

via MITRE·04:17 PM

RemedyDescriptionSeverityWeakness

Frequently Asked Questions

Which deployments are exposed to this issue?

The affected role is a Junos Fusion Aggregation Device running Junos OS where dot1x synchronization is enabled for the required Fusion satellite topology. The issue involves the dot1x daemon.

What access does an attacker need to exploit it?

An attacker must be adjacent to the target and act as the configured ICCP peer. No privileges or user interaction are required.

What could exploitation allow?

Exploitation can crash the dot1x daemon, causing a denial of service. It may also allow code execution as root.

Is dot1x synchronization relevant to exploitation?

Yes. The vulnerability is triggered when dot1x synchronization is enabled for the required Fusion satellite topology.