CVE-2026-102080
Junos OS: MX Series: Malformed SyncE or PTP clock input causes continuous RE switchover
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.
Attack profile
How easy it is to exploit
- Attack vector
- Adjacent network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Junos OS: MX Series: Malformed SyncE or PTP clock input causes continuous RE switchover
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.
- Record
CVE-2026-102080- CVSS 4.0
- 6.0 Medium
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:U/RE:M - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-413
- Updated
- 2026-11-02
EUVDEUVD-2026-101464
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.
- Record
EUVD-2026-101464- CVSS 4.0
- 6.0 Medium
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:U/RE:M - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-gvgv-h84m-5m5q
An Improper Resource Locking vulnerability in the clock synchronization daemon (clksyncd) of...
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.
- Record
GHSA-gvgv-h84m-5m5q- CVSS 4.0
- 6.0 Medium
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:X/RE:M/U:X - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-413
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-102080- CVSS 4.0
- 6.0 Medium
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:X/RE:M/U:X - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-413
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-102080 is a medium vulnerability (CVSS 6.0) in Juniper Networks Junos Os, published October 14, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.18%, the 7th percentile. No source names a fixed version.