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Junos OS
PRODUCT· dossier confidence 80%
Juniper's Junos OS has a concerning history of high-severity security vulnerabilities, particularly remote code execution flaws, indicating potential weaknesses in its security posture. These vulnerabilities frequently involve authentication bypasses and issues within the J-Web interface, requiring careful monitoring and patching.
PROFILE
CategoryNetworking Hardware/SoftwareWhat they doJunos OS is a network operating system developed by Juniper Networks, used on routers, switches, and security appliances. It provides a range of networking features and services for enterprise and service provider environments.
SECURITY POSTURE
Junos OS has demonstrated a history of significant security vulnerabilities, frequently involving remote code execution (RCE). The repeated occurrence of high-severity RCE vulnerabilities suggests potential weaknesses in the development and security review processes.
Notable failures
- CVE-2023-36847: Missing authentication, arbitrary file upload
- CVE-2023-36851: Missing authentication, file upload via J-Web
- CVE-2023-36846: Missing authentication, file upload via J-Web
- CVE-2023-36844: PHP External Variable Modification Vulnerability
- CVE-2023-36845: PHP External Variable Modification Vulnerability
- CVE-2025-21590: Arbitrary code injection due to improper isolation
Patterns: Repeated high-severity RCE vulnerabilities; Authentication bypass leading to file upload; Vulnerabilities in J-Web interface; PHP vulnerabilities
FAILURE HISTORY · 7
| DATE | EVENT | SEV | SUMMARY |
|---|---|---|---|
| 2022-03-25 | CVE-2020-1631 | high | Juniper Junos OS path traversal flaw in J-Web and related services allows unauthenticated remote code execution. |
| 2023-11-13 | CVE-2023-36851 | high | Juniper Junos OS SRX Series missing authentication for critical function allows file upload via J-Web. |
| 2023-11-13 | CVE-2023-36846 | high | Juniper Junos OS SRX Series missing authentication for critical function allows file upload via J-Web. |
| 2023-11-13 | CVE-2023-36844 | high | Juniper Junos OS EX Series PHP External Variable Modification Vulnerability |
| 2023-11-13 | CVE-2023-36845 | high | Juniper Junos OS PHP External Variable Modification Vulnerability |
| 2023-11-13 | CVE-2023-36847 | high | Juniper Junos OS EX Series missing authentication for critical function allows arbitrary file upload. |
| 2025-03-13 | CVE-2025-21590 | high | Juniper Junos OS allowed local attackers with high privileges to inject arbitrary code due to improper isolation. |
DOSSIER SOURCES
- Junos OS: Releases, patches & end-of-life - versio.io · www.versio.io
- Patch Feed - Security Patch Monitoring Dashboard for 60+ Vendors · patchfeed.dev
- CVE Statistics by Vendor 2026 — Vulnerability Counts & Trends · securityonline.info
Open questions: What is the current status of remediation for the identified CVEs? · What are Juniper's internal processes for vulnerability management and patching? · What is the root cause of the recurring authentication bypass issues?
DOSSIER · dex-RAG synthesis · grounded in our own collection + trusted sourcesbuilt 2026-08-03 03:49:41.174827+00:00