ACTIVELY EXPLOITED
CVE-2023-36847: Juniper Junos OS EX Series Missing Authentication for Critical Function Vulnerability
| Vendor | Juniper |
|---|---|
| Product | Junos OS |
| Actively exploited | Yes |
| Added to CISA KEV | 13 Nov 2023 |
| CISA federal deadline | 17 Nov 2023 |
| Weakness (CWE) | CWE-306 |
Required action (CISA's text)
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Description (NVD)
Juniper Junos OS on EX Series contains a missing authentication for critical function vulnerability that allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity. With a specific request to installAppPackage.php that doesn't require authentication, an attacker is able to upload arbitrary files via J-Web, leading to a loss of integrity for a certain part of the file system, which may allow chaining to other vulnerabilities.
SOURCES
Other Juniper flaws
- CVE-2015-7755: Juniper ScreenOS Improper Authentication Vulnerability
- CVE-2025-21590: Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability
- CVE-2023-36851: Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability
- CVE-2023-36846: Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability
- CVE-2023-36845: Juniper Junos OS EX Series and SRX Series PHP External Variable Modification Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.