// For flags

CVE-2025-21590

Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability

Severity Score

6.7
*CVSS v4

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

Yes
*KEV

Decision

Act
*SSVC
Descriptions

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.

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.

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

*Credits: Juniper SIRT would like to acknowledge and thank Matteo Memelli from Amazon for responsibly reporting this issue. Note: Amazon found the issue during internal security research and not due to exploitation.
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Attack Requirements
None
Privileges Required
High
User Interaction
None
System
Vulnerable | Subsequent
Confidentiality
None
None
Integrity
High
None
Availability
None
None
Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Attack Vector
Local
Attack Complexity
Low
Authentication
Multiple
Confidentiality
None
Integrity
Complete
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Act
Exploitation
Active
Automatable
No
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2024-12-26 CVE Reserved
  • 2025-03-12 CVE Published
  • 2025-03-13 Exploited in Wild
  • 2025-04-03 KEV Due Date
  • 2025-05-06 CVE Updated
  • 2025-05-19 EPSS Updated
  • ---------- First Exploit
CWE
  • CWE-653: Improper Isolation or Compartmentalization
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Juniper Networks
Search vendor "Juniper Networks"
 Junos OS
Search vendor "Juniper Networks" for product "Junos OS"
 < 21.2R3-S9
Search vendor "Juniper Networks" for product "Junos OS" and version " < 21.2R3-S9"
en
Affected
Juniper Networks
Search vendor "Juniper Networks"
 Junos OS
Search vendor "Juniper Networks" for product "Junos OS"
 >= 21.4 < 21.4R3-S10
Search vendor "Juniper Networks" for product "Junos OS" and version " >= 21.4 < 21.4R3-S10"
en
Affected
Juniper Networks
Search vendor "Juniper Networks"
 Junos OS
Search vendor "Juniper Networks" for product "Junos OS"
 >= 22.2 < 22.2R3-S6
Search vendor "Juniper Networks" for product "Junos OS" and version " >= 22.2 < 22.2R3-S6"
en
Affected
Juniper Networks
Search vendor "Juniper Networks"
 Junos OS
Search vendor "Juniper Networks" for product "Junos OS"
 >= 22.4 < 22.4R3-S6
Search vendor "Juniper Networks" for product "Junos OS" and version " >= 22.4 < 22.4R3-S6"
en
Affected
Juniper Networks
Search vendor "Juniper Networks"
 Junos OS
Search vendor "Juniper Networks" for product "Junos OS"
 >= 23.2 < 23.2R2-S3
Search vendor "Juniper Networks" for product "Junos OS" and version " >= 23.2 < 23.2R2-S3"
en
Affected
Juniper Networks
Search vendor "Juniper Networks"
 Junos OS
Search vendor "Juniper Networks" for product "Junos OS"
 >= 23.4 < 23.4R2-S4
Search vendor "Juniper Networks" for product "Junos OS" and version " >= 23.4 < 23.4R2-S4"
en
Affected
Juniper Networks
Search vendor "Juniper Networks"
 Junos OS
Search vendor "Juniper Networks" for product "Junos OS"
 >= 24.2 < 24.2R1-S2
Search vendor "Juniper Networks" for product "Junos OS" and version " >= 24.2 < 24.2R1-S2"
en
Affected
Juniper Networks
Search vendor "Juniper Networks"
 Junos OS
Search vendor "Juniper Networks" for product "Junos OS"
 >= 24.2 < 24.2R2
Search vendor "Juniper Networks" for product "Junos OS" and version " >= 24.2 < 24.2R2"
en
Affected