CVE-2025-59957 (GCVE-0-2025-59957)

Vulnerability from cvelistv5 – Published: 2025-10-09 15:43 – Updated: 2025-10-09 19:49
VLAI
Title
Junos OS: EX4600 Series and QFX5000 Series: An attacker with physical access can open a persistent backdoor
Summary
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.
Severity
6.8 (Medium)
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7 (High)
CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/AU:N/R:U/RE:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-09 19:45 UTC
CWE
  • CWE-346 - Origin Validation Error
Assigner
juniper CNA under the mitre root
CNA scorecard B 84/100 over 193 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Juniper Networks Junos OS Affected: 0 , < 21.4R3 (semver)
Affected: 22.2 , < 22.2R3-S3 (semver)
guessed Create a notification for this product.
Date Public
2025-10-08 12:20
Show details on NVD website
To clipboard 

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            "value": "Una vulnerabilidad de error de validaci\u00f3n de origen en un archivo insuficientemente protegido de Juniper Networks Junos OS en las series EX4600 y QFX5000 permite a un atacante no autenticado con acceso f\u00edsico al dispositivo crear una puerta trasera que permite el control completo del sistema.\n\nCuando un dispositivo no est\u00e1 configurado con una contrase\u00f1a de root, un atacante puede modificar un archivo espec\u00edfico. Sus contenidos ser\u00e1n a\u00f1adidos a la configuraci\u00f3n de Junos del dispositivo sin ser visibles. Esto permite la adici\u00f3n de cualquier configuraci\u00f3n desconocida para el operador real, lo que incluye usuarios, direcciones IP y otra configuraci\u00f3n que podr\u00eda permitir el acceso no autorizado al dispositivo.\nEste exploit es persistente a trav\u00e9s de los reinicios e incluso la puesta a cero.\n\nEl indicador de compromiso es un archivo /etc/config/\u003cplatform\u003e-defaults[-flex].conf modificado. Revise ese archivo en busca de declaraciones de configuraci\u00f3n inesperadas, o comp\u00e1relo con una versi\u00f3n sin modificar que se puede extraer del archivo de imagen de software original de Juniper. Para obtener detalles sobre el procedimiento de extracci\u00f3n, p\u00f3ngase en contacto con el Centro de Asistencia T\u00e9cnica de Juniper (JTAC).\n\nPara restaurar el dispositivo a una configuraci\u00f3n inicial de confianza, el sistema necesita ser reinstalado desde medios f\u00edsicos.\n\nEste problema afecta a Junos OS en las series EX4600 y QFX5000:\n\n  * Todas las versiones anteriores a 21.4R3,\n  * versiones 22.2 anteriores a 22.2R3-S3."
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}



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