CVE-2025-21590
Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability
MITRE ATT&CK techniques
How this vulnerability maps to adversary behaviour, from the Center for Threat-Informed Defense's public CVE→ATT&CK mappings. Use it to check whether your detections already cover the technique.
Summary
Juniper Junos OS contains an improper isolation or compartmentalization vulnerability. This vulnerability could allows a local attacker with high privileges to inject arbitrary code.
Affected software
Vendor: Juniper · Product: Junos OS
Weakness types (CWE):
What to do
This vulnerability appears in CISA's Known Exploited Vulnerabilities catalog, meaning it is being exploited in the wild. Prioritize patching affected systems and verify exposure across your estate.
Related vulnerabilities in Juniper
| CVE | Name | EPSS | Exploited |
|---|---|---|---|
| CVE-2023-36845 | Juniper Junos OS EX Series and SRX Series PHP External Variable Modification Vul | 95.1% | Yes |
| CVE-2023-36846 | Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnera | 93.5% | Yes |
| CVE-2023-36844 | Juniper Junos OS EX Series PHP External Variable Modification Vulnerability | 90.0% | Yes |
| CVE-2023-36847 | Juniper Junos OS EX Series Missing Authentication for Critical Function Vulnerab | 83.5% | Yes |
| CVE-2015-7755 | Juniper ScreenOS Improper Authentication Vulnerability | 61.1% | Yes |
| CVE-2020-1631 | Juniper Junos OS Path Traversal Vulnerability | 4.9% | Yes |
| CVE-2023-36851 | Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnera | 1.1% | Yes |
Is your domain exposed?
Run a free, instant security report for any domain — exposure score, email auth, TLS and breach metadata.
Get your free reportSources: CISA KEV catalog · NVD · FIRST EPSS · MITRE ATT&CK® · CTID Mappings Explorer
This product uses the NVD API but is not endorsed or certified by the NVD. © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. MITRE ATT&CK and ATT&CK are registered trademarks of The MITRE Corporation.
All information is aggregated from public sources for awareness only and does not constitute an accusation or a security assessment. No personal data or credentials are published.