CVE-2026-33791: 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.
Affected Software
Remediation
Information
Event History
Frequently Asked Questions
What is the severity of CVE-2026-33791?
CVE-2026-33791 is considered a high severity vulnerability due to its potential for arbitrary shell injection as root.
How do I fix CVE-2026-33791?
To mitigate CVE-2026-33791, upgrade to a patched version of Junos OS or Junos OS Evolved that addresses this vulnerability.
What types of systems are affected by CVE-2026-33791?
CVE-2026-33791 affects various versions of Juniper Networks Junos OS and Junos OS Evolved, specifically versions prior to the specified updates.
Can CVE-2026-33791 be exploited remotely?
No, CVE-2026-33791 requires local access with high privileges to exploit the vulnerability.
What are the consequences of exploiting CVE-2026-33791?
Exploiting CVE-2026-33791 can allow an attacker to execute arbitrary commands with root privileges, potentially compromising the affected system.