CVE-2026-102059: CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in Juniper Networks Junos OS
Description
CVE-2026-102059 is an OS command injection vulnerability in the phone-home daemon (phcd) of Juniper Networks Junos OS and Junos OS Evolved on EX, SRX, and QFX Series devices. An adjacent unauthenticated attacker can exploit this flaw via a rogue DHCP server to execute arbitrary commands with root privileges. The vulnerability affects multiple versions prior to specific patch releases. It has a high severity with a CVSS score of 8.8. No known exploits in the wild have been reported. The vendor has not provided explicit patch links in the provided data.
CVSS v3.1
Score 8.8high
Affected software
Juniper Networks
Junos OS
Juniper Networks
Junos OS Evolved
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves improper neutralization of special elements in OS commands (CWE-78) within the phone-home daemon (phcd) component of Juniper Networks Junos OS and Junos OS Evolved. An attacker positioned adjacent to the target network can deploy a rogue DHCP server to trigger the vulnerability, resulting in arbitrary command execution with root privileges. The affected versions span multiple release trains and include both standard and evolved OS variants on EX, SRX, and QFX Series hardware. The CVSS 3.1 base score is 8.8, indicating high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation allows an unauthenticated adjacent attacker to execute arbitrary commands as root on affected devices. This compromises the confidentiality, integrity, and availability of the system, potentially leading to full system compromise.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no explicit patch links or official fixes are provided in the input data, users should monitor Juniper Networks advisories for updates. Until a patch is applied, network segmentation to prevent rogue DHCP servers and limiting access to trusted DHCP infrastructure may reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- juniper
- Date Reserved
- 2026-09-28T17:35:40.523Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6acfb66b2cdf04f6569794e0
Added to database: 10/14/2026, 17:05:47 UTC
Last enriched: 10/14/2026, 18:04:57 UTC
Last updated: 10/14/2026, 20:48:31 UTC
Views: 6
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