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CVE-2023-36847

Medium 5.3 Exploited in the wild (KEV)

Confirmed active exploitation — CISA KEV catalog

Name
Juniper Junos OS EX Series Missing Authentication for Critical Function Vulnerability
Added to catalog
Remediation due date (US federal)
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Description

A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on EX Series 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. This issue affects Juniper Networks Junos OS on EX Series: * All versions prior to 20.4R3-S8; * 21.1 versions 21.1R1 and later; * 21.2 versions prior to 21.2R3-S6; * 21.3 versions prior to 21.3R3-S5; * 21.4 versions prior to 21.4R3-S4; * 22.1 versions prior to 22.1R3-S3; * 22.2 versions prior to 22.2R3-S1; * 22.3 versions prior to 22.3R2-S2, 22.3R3; * 22.4 versions prior to 22.4R2-S1, 22.4R3.

Metrics

CVSS 3.1
5.3 (MEDIUM) Score source: NVD CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS — exploit probability
83% (percentile: 100) as of 2 November 2026
CWE
CWE-306

Affected products

juniper: junos; juniper: ex2200; juniper: ex2200-c; juniper: ex2200-vc; juniper: ex2300; juniper: ex2300-24mp; juniper: ex2300-24p; juniper: ex2300-24t; juniper: ex2300-48mp; juniper: ex2300-48p; juniper: ex2300-48t; juniper: ex2300-c; juniper: ex2300m; juniper: ex3200; juniper: ex3300

References