CVE-2025-21590

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 v3 vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

Weaknesses (CWE)

CWE-653

Threats tracking this CVE

• UNC3886 Zero-Day Rootkit Campaign Targeting Singaporean Telecommunications — ORB Network C2, Fortinet/VMware Exploitation, Covert Infrastructure Persistence — CRITICAL

References

• https://cloud.google.com/blog/topics/threat-intelligence/china-nexus-espionage-targets-juniper-routers
• https://supportportal.juniper.net/JSA93446
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21590

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