An Origin Validation Error vulnerability in an insufficient protected file of Juniper Networks Junos OS on EX4600 Series and QFX5000 Series allows an unauthenticated attacker with physical access to the device to create a backdoor which allows complete control of the system.
When a device isn't configured with a root password, an attacker can modify a specific file. It's contents will be added to the Junos configuration of the device without being visible. This allows for the addition of any configuration unknown
to the actual operator, which includes users, IP addresses and other configuration which could allow unauthorized access to the device.
This exploit is persistent across reboots and even zeroization.
The indicator of compromise is a modified /etc/config/<platform>-defaults[-flex].conf file. Review that file for unexpected configuration statements, or compare it to an unmodified version which can be extracted from the original Juniper software image file. For details on the extraction procedure please contact Juniper Technical Assistance Center (JTAC).
To restore the device to a trusted initial configuration the system needs to be reinstalled from physical media.
This issue affects Junos OS on EX4600 Series and QFX5000 Series:
* All versions before 21.4R3,
* 22.2 versions before 22.2R3-S3.
References
| Link | Resource |
|---|---|
| https://support.juniper.net/support/requesting-support/ | Vendor Advisory |
| https://supportportal.juniper.net/JSA103146 | Vendor Advisory |
| https://supportportal.juniper.net/s/article/EX-QFX-Procedure-to-format-install-QFX5K-device-using-a-USB | Technical Description |
Configurations
Configuration 1 (hide)
| AND |
|
History
23 Jan 2026, 18:35
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://support.juniper.net/support/requesting-support/ - Vendor Advisory | |
| References | () https://supportportal.juniper.net/JSA103146 - Vendor Advisory | |
| References | () https://supportportal.juniper.net/s/article/EX-QFX-Procedure-to-format-install-QFX5K-device-using-a-USB - Technical Description | |
| First Time |
Juniper qfx5700
Juniper qfx5200 Juniper ex4650 Juniper qfx5120 Juniper Juniper qfx5210 Juniper qfx5230-64cd Juniper qfx5240 Juniper qfx5241 Juniper qfx5220 Juniper junos Juniper qfx5130 Juniper qfx5110 Juniper ex4600 |
|
| CPE | cpe:2.3:o:juniper:junos:22.2:-:*:*:*:*:*:* cpe:2.3:o:juniper:junos:22.2:r3:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.4:r2:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.4:r1:*:*:*:*:*:* cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.4:-:*:*:*:*:*:* cpe:2.3:o:juniper:junos:22.2:r1-s1:*:*:*:*:*:* cpe:2.3:o:juniper:junos:22.2:r1:*:*:*:*:*:* cpe:2.3:h:juniper:qfx5241:-:*:*:*:*:*:*:* cpe:2.3:o:juniper:junos:22.2:r3-s1:*:*:*:*:*:* cpe:2.3:h:juniper:qfx5240:-:*:*:*:*:*:*:* cpe:2.3:o:juniper:junos:22.2:r2-s1:*:*:*:*:*:* cpe:2.3:h:juniper:qfx5220:-:*:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.4:r1-s2:*:*:*:*:*:* cpe:2.3:h:juniper:qfx5110:-:*:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.4:r2-s1:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.4:r1-s1:*:*:*:*:*:* cpe:2.3:h:juniper:qfx5700:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:qfx5120:-:*:*:*:*:*:*:* cpe:2.3:o:juniper:junos:22.2:r3-s2:*:*:*:*:*:* cpe:2.3:h:juniper:ex4600:-:*:*:*:*:*:*:* cpe:2.3:o:juniper:junos:22.2:r2:*:*:*:*:*:* cpe:2.3:h:juniper:qfx5130:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:qfx5210:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:qfx5230-64cd:-:*:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.4:r2-s2:*:*:*:*:*:* cpe:2.3:h:juniper:qfx5200:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:ex4650:-:*:*:*:*:*:*:* cpe:2.3:o:juniper:junos:22.2:r2-s2:*:*:*:*:*:* cpe:2.3:o:juniper:junos:22.2:r1-s2:*:*:*:*:*:* |
09 Oct 2025, 16:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-10-09 16:15
Updated : 2026-01-23 18:35
NVD link : CVE-2025-59957
Mitre link : CVE-2025-59957
CVE.ORG link : CVE-2025-59957
JSON object : View
Products Affected
juniper
- ex4650
- qfx5130
- qfx5220
- qfx5230-64cd
- ex4600
- qfx5240
- qfx5200
- qfx5700
- qfx5210
- qfx5120
- junos
- qfx5110
- qfx5241
CWE
CWE-346
Origin Validation Error