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CVE-2023-36851

Medium 5.3 Exploited in the wild (KEV)

Confirmed active exploitation — CISA KEV catalog

Name
Juniper Junos OS SRX 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 SRX Series allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity. With a specific request to webauth_operation.php that doesn't require authentication, an attacker is able to upload and download arbitrary files via J-Web, leading to a loss of integrity or confidentiality, which may allow chaining to other vulnerabilities. This issue affects Juniper Networks Junos OS on SRX Series: * 21.2 versions prior to 21.2R3-S8; * 21.4 versions prior to 21.4R3-S6; * 22.1 versions prior to 22.1R3-S5; * 22.2 versions prior to 22.2R3-S3; * 22.3 versions prior to 22.3R3-S2; * 22.4 versions prior to 22,4R2-S2, 22.4R3; * 23.2 versions prior to 23.2R1-S2, 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
1% (percentile: 66) 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