Vulnerability Intelligence Report
Junos OS: An local attacker with shell access can execute arbitrary code
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.
CISA KEV
SSVC: Active Exploitation
CVSS Base Score
4.4
MEDIUM
Exploitability:0.8
Impact Score:3.6
EPSS Probability:1.66%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-653 ↗CWE-653 Improper Isolation or Compartmentalization
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Juniper Networks | Junos OS | 0 < 21.2R3-S9 (affected), 21.4 < 21.4R3-S10 (affected), 22.2 < 22.2R3-S6 (affected), 22.4 < 22.4R3-S6 (affected), 23.2 < 23.2R2-S3 (affected), 23.4 < 23.4R2-S4 (affected), 24.2 < 24.2R1-S2, 24.2R2 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Juniper Networks, Inc. · Vendor · USA |
| Reserved | 2024-12-26T14:47:11 |
| Published | 2025-03-12T13:59:43 |
| Patch Date | 2025-03-12 |
| Last Updated | 2026-02-26T19:09:35 |
Community Chatter & Buzz