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CVE-2025-59957

Medienbericht
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.
Verknüpft mit AI von unstrukturierten Daten zu bestehenden CPE der NVD
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HerstellerJuniper Networks
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Produkt Junos OS
Default Statusunaffected
Version < 21.4R3
Version 0
Status affected
Version < 22.2R3-S3
Version 22.2
Status affected
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.01% 0.01
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
sirt@juniper.net 6.8 0.9 5.9
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
sirt@juniper.net 7 0 0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:U/V:X/RE:H/U:X
CWE-346 Origin Validation Error

The product does not properly verify that the source of data or communication is valid.