CVE WatchOct 15, 2026

CVE-2026-102080

An Improper Resource Locking vulnerability in the clock synchronization daemon (clksyncd) of Juniper Networks Junos OS on MX Series allows a

CVSS

5.3

Medium

EPSS

0.2%

KEV

—

Exploit Today

0-100

Published: Oct 14, 2026 · Last modified: Oct 15, 2026 · CWE-413

EPSS · 30d

0.2%EPSS · 30 days0.2%

2026-10-152026-10-20

Technical description

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.

Official references

supportportal.juniper.nethttps://supportportal.juniper.net/JSA112178

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