CVE-2026-33791

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.

Affected Software

Weaknesses

• CWE-78: CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Workarounds

One of the following mitigations will prevent malicious exploitation:

• Use access lists or firewall filters to limit access to the CLI only from trusted hosts and administrators.
• Avoid configuring access to any part of the 'set system'​ stanza for non-privileged users.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://kb.juniper.net/JSA107875
• https://supportportal.juniper.net/JSA107875

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