---
id: CVE-2026-102080
title: >-
  An Improper Resource Locking vulnerability in the clock synchronization daemon
  (clksyncd) of Juniper Networks Junos OS on MX Series allows a unauthenticated,
  logically adjacent attacker to cause a Denial-of-Service (DoS).




  If a SyncE o…
summary: >-
  An Improper Resource Locking vulnerability in the clock synchronization daemon
  (clksyncd) of Juniper Networks Junos OS on MX Series allows a unauthenticated,
  logically adjacent attacker to cause a Denial-of-Service (DoS).




  If a SyncE o…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-413
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T17:18:03.703'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102080'
references:
  - url: 'https://supportportal.juniper.net/JSA112178'
    label: sirt@juniper.net
tags:
  - nvd
ingestedAt: '2026-10-14T17:44:53.665Z'
---

## Overview

An Improper Resource Locking vulnerability in the clock synchronization daemon (clksyncd) of Juniper Networks Junos OS on MX Series allows a unauthenticated, logically adjacent attacker to cause a Denial-of-Service (DoS).



If a SyncE or PTP upstream node sends a malformed message to an MX device equipped with SCBE3, a false 19.44MHz alarm is generated on the master RE. This leads to persistent RE switchovers and a clksyncd process crash. This issue is outside the attacker's direct control as it's a race condition.

This issue affects Junos OS on MX Series:


  *  All versions before 23.2R2-S7.7;
  *  23.4 versions before 23.4R2-S8.13;
  *  24.2 versions before 24.2R2-S5.5;
  *  24.4 versions before 24.4R2-S4;
  *  25.2 versions before 25.2R2-S1;
  *  25.4 versions before 25.4R1-S2.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.