CVE-2026-102080
CVE-2026-102080 · Junos OS: MX Series: Malformed SyncE or PTP clock input causes continuous RE switchover
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 6.0 · Medium · EPSS 0.2% · Fix available
- Published
- Updated
Affected products and versions
junos os
- Versions
- ≥ 0, < 23.2R2-S7.7: Affected (custom)
- ≥ 23.4, < 23.4R2-S8.13: Affected (custom)
- ≥ 24.2, < 24.2R2-S5.5: Affected (custom)
- ≥ 24.4, < 24.4R2-S4: Affected (custom)
- ≥ 25.2, < 25.2R2-S1: Affected (custom)
- ≥ 25.4, < 25.4R1-S2: Affected (custom)
Update to 23.2R2-S7.7