CVEvulnerability

CVE-2025-21590

6.7 MEDIUM Known exploited Published 2025-03-12 Modified 2026-10-01 Official page ↗

CISA Known Exploited Vulnerability

Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability — Juniper Junos OS

Juniper Junos OS contains an improper isolation or compartmentalization vulnerability. This vulnerability could allows a local attacker with high privileges to inject arbitrary code.

Added to KEV
2025-03-13
Remediation due
2025-04-03
Ransomware use
Unknown
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes
https://supportportal.juniper.net/s/article/2025-03-Out-of-Cycle-Security-Bulletin-Junos-OS-A-local-attacker-with-shell-access-can-execute-arbitrary-code-CVE-2025-21590?language=en_US ; https://nvd.nist.gov/vuln/detail/CVE-2025-21590
Status
Analyzed
Published
2025-03-12
Last modified
2026-10-01
Assigner
[email protected]
CVSS 4.0 ([email protected])
6.7 MEDIUM — CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1 ([email protected])
4.4 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
Weaknesses
CWE-653

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.

Affected configurations

• juniper junos (< 21.2) • juniper junos 21.2 • juniper junos 21.4 • juniper junos 22.2 • juniper junos 22.4 • juniper junos 23.2 • juniper junos 23.4 • juniper junos 24.2

Related

Weakness · CWE (1)

  • CWE-653 Improper Isolation or Compartmentalization weakness

References