Junos OS (SRX firewalls)
CVE-2024-39518: MX240, MX480, MX960 platforms using MPC10E: Memory leak will be observed when subscribed to a specific subscription on Junos Telemetry Interface
A Heap-based Buffer Overflow vulnerability in the telemetry sensor process (sensord) of Juniper Networks Junos OS on MX240, MX480, MX960 platforms using MPC10E causes a steady increase in memory utilization, ultimately leading to a Denial of Service (DoS).
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Junos OS (MX240 using MPC10E, MX480 using MPC10E, MX960 using MPC10E) 21.2R3-S5 | 21.2R3-S7 or later |
| Junos OS (MX240 using MPC10E, MX480 using MPC10E, MX960 using MPC10E) 21.4R3-S4 | 21.4R3-S6 or later |
| Junos OS (MX240 using MPC10E, MX480 using MPC10E, MX960 using MPC10E) 22.2R3 | 22.2R3-S4 or later |
| Junos OS (MX240 using MPC10E, MX480 using MPC10E, MX960 using MPC10E) 22.3R2 | 22.3R3-S2 or later |
| Junos OS (MX240 using MPC10E, MX480 using MPC10E, MX960 using MPC10E) 22.4R1 | 22.4R3 or later |
| Junos OS (MX240 using MPC10E, MX480 using MPC10E, MX960 using MPC10E) 23.2R1 | 23.2R2 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A Heap-based Buffer Overflow vulnerability in the telemetry sensor process (sensord) of Juniper Networks Junos OS on MX240, MX480, MX960 platforms using MPC10E causes a steady increase in memory utilization, ultimately leading to a Denial of Service (DoS).
When the device is subscribed to a specific subscription on Junos Telemetry Interface, a slow memory leak occurs and eventually all resources are consumed and the device becomes unresponsive. A manual reboot of the Line Card will be required to restore the device to its normal functioning.
This issue is only seen when telemetry subscription is active.
The Heap memory utilization can be monitored using the following command: > show system processes extensive
The following command can be used to monitor the memory utilization of the specific sensor > show system info | match sensord PID NAME MEMORY PEAK MEMORY %CPU THREAD-COUNT CORE-AFFINITY UPTIME
1986 sensord 877.57MB 877.57MB 2 4 0,2-15 7-21:41:32
This issue affects Junos OS:
- from 21.2R3-S5 before 21.2R3-S7,
- from 21.4R3-S4 before 21.4R3-S6,
- from 22.2R3 before 22.2R3-S4,
- from 22.3R2 before 22.3R3-S2,
- from 22.4R1 before 22.4R3,
- from 23.2R1 before 23.2R2.
Workarounds
There are no known workarounds for this issue.
Exploitation
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.