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.
Published: 2023-09-26
Score: 5.3 Medium
EPSS: 15.3% Moderate
KEV: Yes
Impact: n/a
Action: n/a
AI Analysis

No analysis available yet.

Remediation

Vendor Solution

The following software releases have been updated to resolve this specific issue: 21.2R3-S8*, 21.4R3-S6*, 22.1R3-S5*, 22.2R3-S3*, 22.3R3-S2*, 22.4R2-S2, 22.4R3*, 23.2R1-S2, 23.2R2*, 23.4R1, and all subsequent releases. *Pending Publication


Vendor Workaround

Disable J-Web, or limit access to only trusted hosts.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Wed, 25 Feb 2026 17:15:00 +0000

Type Values Removed Values Added
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. 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.

Tue, 21 Oct 2025 23:15:00 +0000


Tue, 21 Oct 2025 20:30:00 +0000


Tue, 21 Oct 2025 19:30:00 +0000


Mon, 03 Feb 2025 17:15:00 +0000

Type Values Removed Values Added
Metrics kev

{'dateAdded': '2023-11-13'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Subscriptions

Juniper Ex2200 Ex2200-c Ex2200-vc Ex2300 Ex2300-24mp Ex2300-24p Ex2300-24t Ex2300-48mp Ex2300-48p Ex2300-48t Ex2300-c Ex2300m Ex3200 Ex3300 Ex3300-vc Ex3400 Ex4200 Ex4200-vc Ex4300 Ex4300-24p Ex4300-24p-s Ex4300-24t Ex4300-24t-s Ex4300-32f Ex4300-32f-dc Ex4300-32f-s Ex4300-48mp Ex4300-48mp-s Ex4300-48p Ex4300-48p-s Ex4300-48t Ex4300-48t-afi Ex4300-48t-dc Ex4300-48t-dc-afi Ex4300-48t-s Ex4300-48tafi Ex4300-48tdc Ex4300-48tdc-afi Ex4300-mp Ex4300-vc Ex4300m Ex4400 Ex4500 Ex4500-vc Ex4550 Ex4550-vc Ex4550\/vc Ex4600 Ex4600-vc Ex4650 Ex6200 Ex6210 Ex8200 Ex8200-vc Ex8208 Ex8216 Ex9200 Ex9204 Ex9208 Ex9214 Ex9250 Ex9251 Ex9253 Junos Srx100 Srx110 Srx1400 Srx1500 Srx210 Srx220 Srx240 Srx240h2 Srx240m Srx300 Srx320 Srx340 Srx3400 Srx345 Srx3600 Srx380 Srx4000 Srx4100 Srx4200 Srx4600 Srx5000 Srx5400 Srx550 Srx550 Hm Srx550m Srx5600 Srx5800 Srx650
cve-icon MITRE

Status: PUBLISHED

Assigner: juniper

Published:

Updated: 2025-10-21T23:05:36.801Z

Reserved: 2023-06-27T16:17:25.277Z

Link: CVE-2023-36851

cve-icon Vulnrichment

Updated: 2024-08-02T17:01:09.845Z

cve-icon NVD

Status : Analyzed

Published: 2023-09-27T15:18:54.877

Modified: 2026-02-26T15:04:04.180

Link: CVE-2023-36851

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses