Junos OS (SRX firewalls)
CVE-2025-30661: Low-privileged user can cause script to run as root, leading to privilege escalation
An Incorrect Permission Assignment for Critical Resource vulnerability in line card script processing of Juniper Networks Junos OS allows a local, low-privileged user to install scripts to be executed as root, leading to privilege escalation.
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 23.2 | 23.2R2-S4 or later |
| Junos OS 23.4 | 23.4R2-S5 or later |
| Junos OS 24.2 | 24.2R2-S1 or later |
| Junos OS 24.4 | 24.4R1-S3, 24.4R2 or later |
| Junos OS 0 | Not affected |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
An Incorrect Permission Assignment for Critical Resource vulnerability in line card script processing of Juniper Networks Junos OS allows a local, low-privileged user to install scripts to be executed as root, leading to privilege escalation.
A local user with access to the local file system can copy a script to the router in a way that will be executed as root, as the system boots. Execution of the script as root can lead to privilege escalation, potentially providing the adversary complete control of the system.
This issue only affects specific line cards, such as the MPC10, MPC11, LC4800, LC9600, MX304-LMIC16, SRX4700, and EX9200-15C.
This issue affects Junos OS: * from 23.2 before 23.2R2-S4, * from 23.4 before 23.4R2-S5, * from 24.2 before 24.2R2-S1, * from 24.4 before 24.4R1-S3, 24.4R2.
This issue does not affect versions prior to 23.1R2.
Workarounds
Use access lists or firewall filters to limit access to the device via CLI only from trusted hosts and administrators.
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.