Medium [CVE-2026-102080] 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)
This medium-severity Juniper Networks advisory covers CVE-2026-102080 affecting Junos OS.
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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 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;
- 25.4 versions before 25.4R1-S2.
- * All versions before 23
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
- 23.2R2-S7.7
- 23.4R2-S8.13
- 24.2R2-S5.5
- 24.4R2-S4
- 25.2R2-S1
- 25.4R1-S2
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
Mitigation
Upgrade to a fixed release: 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S4, 25.2R2-S1, 25.4R1-S2. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
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