CVE-2026-33791: CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in Juniper Networks Junos OS
CVE-2026-33791 is an OS Command Injection vulnerability in Juniper Networks Junos OS and Junos OS Evolved. It allows a local, high-privileged attacker to execute crafted CLI commands that inject arbitrary shell commands running as root. This vulnerability arises from improper sanitization of certain 'set system' commands. Exploitation can lead to complete system compromise. The issue affects multiple versions of Junos OS and Junos OS Evolved prior to specific patched releases. The CVSS score is 6. 7, indicating medium severity. No official patch or remediation level is currently confirmed in the provided data.
AI Analysis
Technical Summary
This vulnerability involves improper neutralization of special elements in the CLI processing of Juniper Junos OS and Junos OS Evolved, specifically in certain 'set system' commands. A local attacker with high privileges can inject arbitrary shell commands executed as root, potentially leading to full system compromise. Affected versions include all versions before 22.4R3-S8 and various subsequent releases up to 25.2R2 for Junos OS and similarly for Junos OS Evolved. The CVSS vector indicates low attack complexity, high privileges required, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation allows a local, high-privileged attacker to execute arbitrary shell commands as root, resulting in complete compromise of the affected system. This includes full control over system confidentiality, integrity, and availability. There are no known exploits in the wild as per the current data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict local access to trusted administrators only and avoid executing untrusted or crafted 'set system' CLI commands. Monitor Juniper Networks advisories closely for updates on patches or official mitigations.
CVE-2026-33791: CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in Juniper Networks Junos OS
Description
CVE-2026-33791 is an OS Command Injection vulnerability in Juniper Networks Junos OS and Junos OS Evolved. It allows a local, high-privileged attacker to execute crafted CLI commands that inject arbitrary shell commands running as root. This vulnerability arises from improper sanitization of certain 'set system' commands. Exploitation can lead to complete system compromise. The issue affects multiple versions of Junos OS and Junos OS Evolved prior to specific patched releases. The CVSS score is 6. 7, indicating medium severity. No official patch or remediation level is currently confirmed in the provided data.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves improper neutralization of special elements in the CLI processing of Juniper Junos OS and Junos OS Evolved, specifically in certain 'set system' commands. A local attacker with high privileges can inject arbitrary shell commands executed as root, potentially leading to full system compromise. Affected versions include all versions before 22.4R3-S8 and various subsequent releases up to 25.2R2 for Junos OS and similarly for Junos OS Evolved. The CVSS vector indicates low attack complexity, high privileges required, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation allows a local, high-privileged attacker to execute arbitrary shell commands as root, resulting in complete compromise of the affected system. This includes full control over system confidentiality, integrity, and availability. There are no known exploits in the wild as per the current data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict local access to trusted administrators only and avoid executing untrusted or crafted 'set system' CLI commands. Monitor Juniper Networks advisories closely for updates on patches or official mitigations.
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: 4/9/2026, 10:21:48 PM
Last updated: 4/9/2026, 11:10:28 PM
Views: 5
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