Junos OS and Junos OS Evolved: Execution of crafted CLI commands allows for arbitrary shell injection as root

Summary

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.

Timeline

1. Apr 9, 2026, 9:38 PM UTCCVE published
2. Apr 13, 2026, 12:00 AM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Apr 22, 2026, 2:48 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  fixed in 22.4R3-S8; From 23.2 · fixed in 23.2R2-S5; From 23.4 · fixed in 23.4R2-S7; From 24.2 · fixed in 24.2R2-S2; From 24.4 · fixed in 24.4R2; From 25.2 · fixed in 25.2R2

• Juniper Networks Junos OS Evolved

  fixed in 22.4R3-S8-EVO; From 23.2 · fixed in 23.2R2-S5-EVO; From 23.4 · fixed in 23.4R2-S7-EVO; From 24.2 · fixed in 24.2R2-S2-EVO; From 24.4 · fixed in 24.4R2-EVO

References 2