Junos OS (SRX firewalls)
CVE-2026-33791: Execution of crafted CLI commands allows for arbitrary shell injection as root
An OS Command Injection vulnerability in the CLI processing of Juniper Networks Junos OS and Junos OS Evolved allows a local, high-privileged attacker executing specific, crafted CLI commands to inject arbitrary shell commands as root, leading to a complete compromise of the system.
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 0 | 22.4R3-S8 or later |
| Junos OS 23.2 | 23.2R2-S5 or later |
| Junos OS 23.4 | 23.4R2-S7 or later |
| Junos OS 24.2 | 24.2R2-S2 or later |
| Junos OS 24.4 | 24.4R2 or later |
| Junos OS 25.2 | 25.2R2 or later |
| Junos OS Evolved 0 | 22.4R3-S8-EVO or later |
| Junos OS Evolved 23.2 | 23.2R2-S5-EVO or later |
| Junos OS Evolved 23.4 | 23.4R2-S7-EVO or later |
| Junos OS Evolved 24.2 | 24.2R2-S2-EVO or later |
| Junos OS Evolved 24.4 | 24.4R2-EVO or later |
| Junos OS Evolved 25.2 | 25.2R1-S1-EVO, 25.2R2-EVO or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
An OS Command Injection vulnerability in the CLI processing of Juniper Networks Junos OS and Junos OS Evolved allows a local, high-privileged attacker executing specific, crafted CLI commands to inject arbitrary shell commands as root, leading to a complete compromise of the system.
Certain 'set system' commands, when executed with crafted arguments, are not properly sanitized, allowing for arbitrary shell injection. These shell commands are executed as root, potentially allowing for complete control of the vulnerable system. This issue affects:
Junos OS:
- all versions before 22.4R3-S8,
- from 23.2 before 23.2R2-S5,
- from 23.4 before 23.4R2-S7,
- from 24.2 before 24.2R2-S2,
- from 24.4 before 24.4R2,
- from 25.2 before 25.2R2;
Junos OS Evolved:
- all versions before 22.4R3-S8-EVO,
- from 23.2 before 23.2R2-S5-EVO,
- from 23.4 before 23.4R2-S7-EVO,
- from 24.2 before 24.2R2-S2-EVO,
- from 24.4 before 24.4R2-EVO,
- from 25.2 before 25.2R1-S1-EVO, 25.2R2-EVO.
Workarounds
One of the following mitigations will prevent malicious exploitation: * Use access lists or firewall filters to limit access to the CLI only from trusted hosts and administrators. * Avoid configuring access to any part of the 'set system' stanza for non-privileged users.
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.