Juniper Junos OS up to 24.4R1-S3 Line Card Script Processing permission assignment

CVSS Meta Temp Score
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CTI Interest Score
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7.1$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Juniper Junos OS up to 24.4R1-S3. This affects an unknown function of the component Line Card Script Processing. This manipulation causes permission assignment. The identification of this vulnerability is CVE-2025-30661. The attack can only be executed locally. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Juniper Junos OS up to 24.4R1-S3. It has been declared as critical. Affected by this vulnerability is an unknown code of the component Line Card Script Processing. The manipulation with an unknown input leads to a permission assignment vulnerability. The CWE definition for the vulnerability is CWE-732. The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at supportportal.juniper.net. This vulnerability is known as CVE-2025-30661 since 03/24/2025. The exploitation appears to be easy. Attacking locally is a requirement. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/27/2026).

The vulnerability scanner Nessus provides a plugin with the ID 310427 (Juniper Junos OS Vulnerability (JSA100057)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 23.1R2, 23.2R2-S4, 23.4R2-S5, 24.2R2-S1, 24.4R1-S3 or 24.4R2 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (310427), EUVD (EUVD-2025-21165) and CERT Bund (WID-SEC-2025-1519). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Juniper MX Series
  • Juniper JUNOS
  • Juniper SRX Series
  • Juniper Security Director
  • Juniper Junos Space

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.1

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.3
CNA Vector (juniper): 🔒

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Permission assignment
CWE: CWE-732 / CWE-275 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 310427
Nessus Name: Juniper Junos OS Vulnerability (JSA100057)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Junos OS 23.1R2/23.2R2-S4/23.4R2-S5/24.2R2-S1/24.4R1-S3/24.4R2

Timelineinfo

03/24/2025 CVE reserved
07/11/2025 +108 days Advisory disclosed
07/11/2025 +0 days VulDB entry created
04/27/2026 +290 days VulDB entry last update

Sourcesinfo

Vendor: juniper.net

Advisory: JSA100057
Status: Confirmed

CVE: CVE-2025-30661 (🔒)
GCVE (CVE): GCVE-0-2025-30661
GCVE (VulDB): GCVE-100-316159
EUVD: 🔒
CERT Bund: WID-SEC-2025-1519 - Juniper JUNOS: Mehrere Schwachstellen ermöglichen Privilegieneskalation

Entryinfo

Created: 07/11/2025 20:24
Updated: 04/27/2026 22:39
Changes: 07/11/2025 20:24 (81), 07/12/2025 09:09 (1), 10/12/2025 01:35 (7), 01/27/2026 00:41 (1), 04/27/2026 22:39 (2)
Complete: 🔍
Cache ID: 216::103

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