CVE-2025-21590

Junos OS: An local attacker with shell access can execute arbitrary code

Published: Mar 12, 2025Updated: Oct 24, 2025 Sources: CVE List NVD BDU

4.4CVSS

MEDIUM

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.

EPSS Score

1.7%

Top 17.3%

CISA KEV

Active Exploitation

Since Mar 13, 2025

Exploits

0 Known

Remediation

Patch Available

CVSS Vector Breakdown

Exploitability

AV:LAttack Vector

Local

AC:LAttack Complexity

Low

PR:HPrivileges Required

High

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:HIntegrity

High

A:NAvailability

None

Weaknesses

CWE-653

Affected Products

Junos OS

Juniper Networks

JunOS

Juniper Networks Inc.

junos

juniper

Exploitability

CISA Known Exploited Vulnerability

Added to KEV:Mar 13, 2025

Remediation due:Apr 3, 2025

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.

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details

Official Patch Available

Workaround Available