CVE-2025-21590 — Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability
CVE-2025-21590: Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability
CISA Known Exploited Vulnerability (KEV)
| Vendor / project | Juniper |
| Product | Junos OS |
| Date added | 2025-03-13 |
| Due date | 2025-04-03 |
| Ransomware campaign use | Unknown |
Description
Juniper Junos OS contains an improper isolation or compartmentalization vulnerability. This vulnerability could allows a local attacker with high privileges to inject arbitrary code.
Required action (CISA)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes
https://supportportal.juniper.net/s/article/2025-03-Out-of-Cycle-Security-Bulletin-Junos-OS-A-local-attacker-with-shell-access-can-execute-arbitrary-code-CVE-2025-21590?language=en_US ; https://nvd.nist.gov/vuln/detail/CVE-2025-21590
References
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-21590
- KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog