CVE-2026-102056: Junos OS and Junos OS Evolved: An attacker causes denial of service and information disclosure when Ethernet CFM is enabled

Published Oct 14, 2026

Updated

An Out-of-bounds Read vulnerability in the cfmd process of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent-network attacker to crash the daemon and disclose limited process memory via a specific CFM Message sent to a configured interface.

Affected Software

2 affected components

Juniper Networks Junos OS

Juniper Networks Junos OS Evolved

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 23.2R2-S7.7-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 23.4R2-S8.11-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 24.2R2-S5.6-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 24.4R2-S5-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 25.2R2-S2-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 25.2X100-D35-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 25.4R1-S3-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 25.4R2-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 25.4X300-D40-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 26.2R1-S2-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 26.2R2-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 26.4R1-EVO
Upgrade
Upgrade Juniper Networks Junos OS to a version that resolves this vulnerability.
Fixed in 23.2R2-S7.7
Upgrade
Upgrade Juniper Networks Junos OS to a version that resolves this vulnerability.
Fixed in 23.4R2-S8.13
Upgrade
Upgrade Juniper Networks Junos OS to a version that resolves this vulnerability.
Fixed in 24.2R2-S5.5
Upgrade
Upgrade Juniper Networks Junos OS to a version that resolves this vulnerability.
Fixed in 24.4R2-S5
Upgrade
Upgrade Juniper Networks Junos OS to a version that resolves this vulnerability.
Fixed in 25.2R2-S2
Upgrade
Upgrade Juniper Networks Junos OS to a version that resolves this vulnerability.
Fixed in 25.4R1-S3
Upgrade
Upgrade Juniper Networks Junos OS to a version that resolves this vulnerability.
Fixed in 25.4R2
Upgrade
Upgrade Juniper Networks Junos OS to a version that resolves this vulnerability.
Fixed in 26.2R1-S2
Upgrade
Upgrade Juniper Networks Junos OS to a version that resolves this vulnerability.
Fixed in 26.2R2
Upgrade
Upgrade Juniper Networks Junos OS to a version that resolves this vulnerability.
Fixed in 26.4R1

Event History

Oct 14, 2026

CVE Published

via MITRE·04:54 PM

Data Sourced

via MITRE·04:54 PM

RemedyDescriptionSeverityWeakness

Frequently Asked Questions

Which systems are exposed to this issue?

Systems running Junos OS or Junos OS Evolved are exposed when Ethernet CFM is enabled and configured on an interface reachable by an adjacent-network attacker.

What access does an attacker need to exploit it?

The attacker does not need authentication or user interaction, but must be on an adjacent network and able to send a specific CFM message to a configured interface.

What is the practical impact of successful exploitation?

Successful exploitation can crash the cfmd daemon, causing denial of service, and can disclose limited memory from the affected process.