CVE-2026-33791: CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in Juniper Networks Junos OS
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.
AI Analysis
Technical Summary
This vulnerability involves improper neutralization of special elements in the CLI processing of Junos OS and Junos OS Evolved. Specifically, certain 'set system' commands accept crafted arguments that allow injection of arbitrary shell commands executed with root privileges. A local attacker with high privileges can exploit this to gain full control over the affected system. Multiple versions of Junos OS and Junos OS Evolved are affected, with fixed versions starting from 22.4R3-S8 and subsequent releases as listed. No official patch or remediation level is explicitly stated in the provided data.
Potential Impact
Successful exploitation allows a local, high-privileged attacker to execute arbitrary shell commands as root, leading to complete compromise of the system's confidentiality, integrity, and availability. This can result in full control over the device running Junos OS or Junos OS Evolved.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no explicit patch or remediation level is provided, users should monitor Juniper Networks advisories for official fixes. Until patched, restrict local access to trusted administrators only and avoid executing untrusted or crafted 'set system' CLI commands.
CVE-2026-33791: CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in Juniper Networks Junos OS
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves improper neutralization of special elements in the CLI processing of Junos OS and Junos OS Evolved. Specifically, certain 'set system' commands accept crafted arguments that allow injection of arbitrary shell commands executed with root privileges. A local attacker with high privileges can exploit this to gain full control over the affected system. Multiple versions of Junos OS and Junos OS Evolved are affected, with fixed versions starting from 22.4R3-S8 and subsequent releases as listed. No official patch or remediation level is explicitly stated in the provided data.
Potential Impact
Successful exploitation allows a local, high-privileged attacker to execute arbitrary shell commands as root, leading to complete compromise of the system's confidentiality, integrity, and availability. This can result in full control over the device running Junos OS or Junos OS Evolved.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no explicit patch or remediation level is provided, users should monitor Juniper Networks advisories for official fixes. Until patched, restrict local access to trusted administrators only and avoid executing untrusted or crafted 'set system' CLI commands.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- juniper
- Date Reserved
- 2026-03-23T19:46:13.672Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d822bf1cc7ad14da2ad16d
Added to database: 4/9/2026, 10:05:51 PM
Last enriched: 4/24/2026, 3:49:55 PM
Last updated: 5/25/2026, 2:41:43 AM
Views: 95
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