EN

CVE-2025-21590

Medium
4.4
0.05.010.0
Year
2025
Published
Mar 12, 2025
Known Affected Devices
0
CVSS Score
4.4

What is 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.

CVSS Vector Breakdown

CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
AV
Attack Vector
Local

Requires local access — attacker must be logged in or have physical access to the device.

AC
Attack Complexity
Low

No special conditions required. Exploit can be performed reliably and repeatedly.

PR
Privileges Required
High

Administrative or root-level privileges required to exploit.

UI
User Interaction
None

No user interaction required. Exploit runs without any victim action.

S
Scope
Unchanged

Exploiting the vulnerability only affects the vulnerable component itself.

C
Confidentiality Impact
None

No confidentiality impact. Sensitive data is not exposed.

I
Integrity Impact
High

Complete loss of integrity. Attacker can modify any file or data on the component.

A
Availability Impact
None

No availability impact. Service remains fully operational.

Known Affected Devices

Juniper Networks Juniper MX5 Juniper Networks Juniper MX104 Juniper Networks Juniper MX240 Juniper Networks Juniper MX480 Juniper Networks Juniper MX960 Juniper Networks Juniper MX2010 Juniper Networks Juniper MX10003 Juniper Networks Juniper PTX10003 Juniper Networks Juniper ACX1000 Juniper Networks Juniper EX2300-24P Juniper Networks Juniper EX2300-48P Juniper Networks Juniper EX2300-C-12T Juniper Networks Juniper EX2300-C-12P Juniper Networks Juniper EX3400-24T Juniper Networks Juniper EX3400-24P Juniper Networks Juniper EX3400-48T Juniper Networks Juniper EX3400-48P Juniper Networks Juniper EX4300-24T Juniper Networks Juniper EX4300-24P Juniper Networks Juniper EX4300-48MP Juniper Networks Juniper EX4400-24T Juniper Networks Juniper EX4400-48F Juniper Networks Juniper SRX300 Juniper Networks Juniper SRX320 Juniper Networks Juniper SRX340 Juniper Networks Juniper SRX345 Juniper Networks Juniper SRX380 Juniper Networks Juniper SRX4100 Juniper Networks Juniper SRX4200 Juniper Networks Juniper SRX4600 Juniper Networks Juniper SRX5400 Juniper Networks Juniper SRX5600 Juniper Networks Juniper SRX5800 Juniper Networks Juniper QFX5100-24Q Juniper Networks Juniper QFX5110-48S Juniper Networks Juniper QFX10008 Juniper Networks Juniper QFX10016

FAQ

How severe is CVE-2025-21590?

CVE-2025-21590 has a CVSS score of 4.4/10, rated as Medium. Review the affected products list and apply vendor patches.

What does the CVSS score mean for CVE-2025-21590?

CVSS (Common Vulnerability Scoring System) rates vulnerability severity from 0.0 to 10.0. CVE-2025-21590 scores 4.4/10 (Medium). Scores 9.0–10.0 are Critical, 7.0–8.9 are High, 4.0–6.9 are Medium, and below 4.0 are Low.

Which devices are affected by CVE-2025-21590?

The list of devices confirmed to be affected by CVE-2025-21590 is shown in the "Affected Devices" section above. Check your firmware version against the vendor security advisory and apply the latest patch.

How do I fix or mitigate CVE-2025-21590?

Apply the latest firmware or software update from the vendor. Check the References section above for official advisories and patch notes. If no patch is available, consider disabling the affected feature or isolating the device from untrusted networks.