Privilege Escalation via Line Card Script Execution on Junos OS <23.2R2-S4
CVE-2025-30661 Published on July 11, 2025
Junos OS: Low-privileged user can cause script to run as root, leading to privilege escalation
An Incorrect Permission Assignment for Critical Resource vulnerability in line card script processing of Juniper Networks Junos OS allows a local, low-privileged user to install scripts to be executed as root, leading to privilege escalation.
A local user with access to the local file system can copy a script to the router in a way that will be executed as root, as the system boots. Execution of the script as root can lead to privilege escalation, potentially providing the adversary complete control of the system.
This issue only affects specific line cards, such as the MPC10, MPC11, LC4800, LC9600, MX304-LMIC16, SRX4700, and EX9200-15C.
This issue affects Junos OS: * from 23.2 before 23.2R2-S4,
* from 23.4 before 23.4R2-S5,
* from 24.2 before 24.2R2-S1,
* from 24.4 before 24.4R1-S3, 24.4R2.
This issue does not affect versions prior to 23.1R2.
Vulnerability Analysis
CVE-2025-30661 can be exploited with local system access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
Incorrect Permission Assignment for Critical Resource
The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors. When a resource is given a permissions setting that provides access to a wider range of actors than required, it could lead to the exposure of sensitive information, or the modification of that resource by unintended parties. This is especially dangerous when the resource is related to program configuration, execution or sensitive user data.
Products Associated with CVE-2025-30661
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Affected Versions
Juniper Networks Junos OS:- Version 23.2 and below 23.2R2-S4 is affected.
- Version 23.4 and below 23.4R2-S5 is affected.
- Version 24.2 and below 24.2R2-S1 is affected.
- Version 24.4 and below 24.4R1-S3, 24.4R2 is affected.
- Before 23.1R2 is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.