Junos OS CLI Command Injection (<22.4R3, 23.2R2, 23.4R2, 24.2R2)
CVE-2026-33791 Published on April 9, 2026
Junos OS and Junos OS Evolved: 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.
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.
Vulnerability Analysis
CVE-2026-33791 can be exploited with local system access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a Shell injection Vulnerability?
The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
CVE-2026-33791 has been classified to as a Shell injection vulnerability or weakness.
Products Associated with CVE-2026-33791
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Affected Versions
Juniper Networks Junos OS:- Before 22.4R3-S8 is affected.
- Version 23.2 and below 23.2R2-S5 is affected.
- Version 23.4 and below 23.4R2-S7 is affected.
- Version 24.2 and below 24.2R2-S2 is affected.
- Version 24.4 and below 24.4R2 is affected.
- Version 25.2 and below 25.2R2 is affected.
- Before 22.4R3-S8-EVO is affected.
- Version 23.2 and below 23.2R2-S5-EVO is affected.
- Version 23.4 and below 23.4R2-S7-EVO is affected.
- Version 24.2 and below 24.2R2-S2-EVO is affected.
- Version 24.4 and below 24.4R2-EVO is affected.
- Version 25.2 and below 25.2R1-S1-EVO, 25.2R2-EVO is affected.