CVE-2026-33791

Technical Description

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

Remediation

Check the references section for vendor advisories and patches from juniper. Update junos to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References