Unrated severityCISA KEVNVD Advisory· Published Mar 12, 2025· Updated Feb 26, 2026
Junos OS: An local attacker with shell access can execute arbitrary code
CVE-2025-21590
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2<21.2R3-S9, <21.4R3-S10, <22.2R3-S6, <22.4R3-S6, <23.2R2-S3, <23.4R2-S4, <24.2R1-S2+ 1 more
- (no CPE)range: <21.2R3-S9, <21.4R3-S10, <22.2R3-S6, <22.4R3-S6, <23.2R2-S3, <23.4R2-S4, <24.2R1-S2
- (no CPE)range: 0
Patches
Vulnerability mechanics
References
2- cloud.google.com/blog/topics/threat-intelligence/china-nexus-espionage-targets-juniper-routersmitrethird-party-advisory
- supportportal.juniper.net/JSA93446mitrevendor-advisory
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