#VU105679 Permissions, Privileges, and Access Controls in Juniper Junos OS - CVE-2025-21590

Vulnerability identifier: #VU105679

Vulnerability risk: High

CVSSv4.0: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2025-21590

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Juniper Junos OS
Operating systems & Components / Operating system

Vendor: Juniper Networks, Inc.

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to improperly imposed security restrictions. A local privileged user can compromise integrity of the device.

Note, the vulnerability is being exploited in the wild.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 21.2R1-S1 - 21.2R3, 21.3R1-S1 - 21.3R3, 21.4R1-S1 - 21.4R3, 22.2R1-S1 - 22.2R3, 22.3R1-S1 - 22.3R3, 22.4R1-S1 - 22.4R3, 23.2R1-S1 - 23.2R2, 23.3R1, 23.4R1-S1 - 23.4R1, 23.4R2-S1 - 23.4R2, 24.2R1-S1 - 24.2R1

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External links
https://cloud.google.com/blog/topics/threat-intelligence/china-nexus-espionage-targets-juniper-routers
https://supportportal.juniper.net/JSA93446
https://supportportal.juniper.net/s/article/2025-03-Reference-Advisory-The-RedPenguin-Malware-Incident?language=en_US

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.