Vulnerability · Published Apr 9, 2026 · Assigned by juniper
CVE-2026-33791Junos OS and Junos OS Evolved: Execution of crafted CLI commands allows for arbitrary shell injection as root
Medium 6.7
In plain English
A medium-severity OS command injection in Junos OS from Juniper Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).
Official 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 before 25.2R1-S1-EVO, 25.2R2-EVO.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Juniper Networks | Junos OS | 0 – before 22.4R3-S823.2 – before 23.2R2-S523.4 – before 23.4R2-S724.2 – before 24.2R2-S224.4 – before 24.4R225.2 – before 25.2R2 |
| Juniper Networks | Junos OS Evolved | 0 – before 22.4R3-S8-EVO23.2 – before 23.2R2-S5-EVO23.4 – before 23.4R2-S7-EVO24.2 – before 24.2R2-S2-EVO24.4 – before 24.4R2-EVO25.2 – before 25.2R1-S1-EVO, 25.2R2-EVO |
Weakness: CWE-78 · Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
References
- https://kb.juniper.net/JSA107875 vendor-advisory
- https://supportportal.juniper.net/JSA107875 vendor-advisory