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CVE-2023-36844

Medium 5.3 Exploited in the wild (KEV)

Confirmed active exploitation — CISA KEV catalog

Name
Juniper Junos OS EX Series PHP External Variable Modification 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 PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series allows an unauthenticated, network-based attacker to control certain, important environment variables. Using a crafted request an attacker is able to modify certain PHP environment variables leading to partial loss of integrity, which may allow chaining to other vulnerabilities. This issue affects Juniper Networks Junos OS on EX Series: * All versions prior to 20.4R3-S9; * 21.1 versions 21.1R1 and later; * 21.2 versions prior to 21.2R3-S7; * 21.3 versions prior to 21.3R3-S5; * 21.4 versions prior to 21.4R3-S5; * 22.1 versions prior to 22.1R3-S4; * 22.2 versions prior to 22.2R3-S2; * 22.3 versions prior to 22.3R3-S1; * 22.4 versions prior to 22.4R2-S2, 22.4R3; * 23.2 versions prior to 23.2R1-S1, 23.2R2.

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
90% (percentile: 100) as of 2 November 2026
CWE
CWE-473

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