CVE-2026-33791: Juniper Junos

Medium severity, CVSS 6.7. EPSS: 0.7% chance of exploitation in the next 30 days.

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

• Juniper Junos: before 22.4 (fixed in 22.4); version 22.4 only; version 23.2 only; version 23.4 only; version 24.2 only; version 24.4 only; …
• Juniper Junos OS Evolved: before 22.4 (fixed in 22.4); version 22.4 only; version 23.2 only; version 23.4 only; version 24.2 only; version 24.4 only; …

Published 2026-04-09. Last modified 2026-06-17.