Overview
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.
https://supportportal.juniper.net/s/article/2023-08-Out-of-Cycle-Security-Bulletin-Junos-OS-SRX-Series-and-EX-Series-Multiple-vulnerabilities-in-J-Web-can-be-combined-to-allow-a-preAuth-Remote-Code-Execution?language=en_US; https://nvd.nist.gov/vuln/detail/CVE-2023-36847
Key Details
| Property | Value |
|---|---|
| CVE ID | CVE-2023-36847 |
| Vendor / Product | Juniper — Junos OS |
| NVD Published | 2023-08-17 |
| NVD Last Modified | 2026-02-26 |
| CVSS 3.1 Score | 5.3 |
| CVSS 3.1 Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| Severity | MEDIUM |
| CWE | CWE-306 |
| CISA KEV Added | 2023-11-13 |
| CISA KEV Deadline | 2023-11-17 |
| Known Ransomware Use | No |
CVSS 3.1 Breakdown
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Required Action
CISA BOD 22-01 Deadline: 2023-11-17.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Timeline
| Date | Event |
|---|---|
| 2023-11-13 | Added to CISA Known Exploited Vulnerabilities catalog |
| 2023-11-17 | CISA BOD 22-01 remediation deadline |
References
| Resource | Type |
|---|---|
| NVD — CVE-2023-36847 | Vulnerability Database |
| CISA KEV Catalog Entry | US Government |