CVE-2025-21590
Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability
IN CISA KEV
Juniper Junos OS contains an improper isolation or compartmentalization vulnerability. This vulnerability could allows a local attacker with high privileges to inject arbitrary code.
- Vendor
- Juniper
- Product
- Junos OS
- CVSS
- No score recorded (no NVD record loaded for this entry)
- CWE
- CWE-653
- Published
- Not recorded
- NVD modified
- Not recorded
CISA KEV
- Date added
- 2025-03-13
- Due date
- 2025-04-03
- Ransomware use
- Unknown
- Required action
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
EPSS
1.74% chance of exploitation in the next 30 days (percentile 77th)
FIRST EPSS, updated 17 Oct 2026. About EPSS
CVSS is severity, EPSS is likelihood, KEV means already exploited. EPSS is a statistical probability, not a certainty: a low score does not make a bug safe, and a high one does not prove it is being exploited.
Data last updated 18 Oct 2026. Sources: NVD API 2.0, CISA KEV catalog, FIRST EPSS. Links: NVD, CISA KEV. Metadata only. ThreatWire does not host exploit code.