CVE-2025-21590 Information

Description

An Improper Isolation or Compartmentalization vulnerability in the kernel of Juniper Networks Junos OS allows a local attacker with high privileges to compromise the integrity of the device.

A local attacker with access to the shell is able to inject arbitrary code which can compromise an affected device. This issue is not exploitable from the Junos CLI. This issue affects Junos OS: 

All versions before 21.2R3-S9
21.4 versions before 21.4R3-S10 
22.2 versions before 22.2R3-S6 
22.4 versions before 22.4R3-S6 
23.2 versions before 23.2R2-S3 
23.4 versions before 23.4R2-S4
24.2 versions before 24.2R1-S2 24.2R2.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

Reference

https://cloud.google.com/blog/topics/threat-intelligence/china-nexus-espionage-targets-juniper-routers https://supportportal.juniper.net/JSA93446

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction Required

HIGH

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

4.4