CVE-2025-21590 KEV
Patch first
On CISA KEV — known exploited in the wild, due 2025-04-03.
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.
Scoring
| CVSS | 4.4 (MEDIUM, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N |
| EPSS | 1.72% — more likely to be exploited than 76% of all CVEs |
| Weakness | CWE-653 |
| On CISA KEV | yes — remediate by 2025-04-03 |
| Public exploit | none known |
| Published | 2025-03-12 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability |
|---|---|
| Added | 2025-03-13 |
| Due | 2025-04-03 |
| Vendor / product | Juniper / Junos OS |
| Ransomware use | none reported |
Affected (1)
| Vendor | Product |
|---|---|
| juniper | junos |
References
→ the Explorer · watch your stack · NVD