MEDIUM CISA KEV

CVE-2025-21590

CVSS v3

4.4

MEDIUM

EPSS Score

1.7 %

exploit probability, as of 2026-10-19

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2025-21590 yet.

Full record on NVD

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.

CISA Known Exploited Vulnerability

Date Added: 2025-03-13
Patch Due Date: 2025-04-03
Ransomware Use: Unknown

Technical details

Published: 2025-03-12

Frequently asked questions

What is CVE-2025-21590?

Is CVE-2025-21590 actively exploited?

Yes. CVE-2025-21590 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2025-04-03.

What is the CVSS score for CVE-2025-21590?

CVE-2025-21590 has a CVSS v3 base score of 4.4 (MEDIUM severity).

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