CVE-2025-21590
CVSS v3
4.4
MEDIUM
EPSS Score
0.9 %
exploit probability
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
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?
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.
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).
Is CVE-2025-21590 affecting your environment?
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