CVE-2023-36851

Junos OS: SRX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload and download arbitrary files

State: Published
Severity: 5.3 Medium
Published: Sep 26, 2023
Updated: Oct 21, 2025
Reserved: Jun 27, 2023

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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.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N	juniper

Weaknesses

CWE-306 Missing Authentication for Critical Function

Affected Products

Product	Versions
Junos OSJuniper Networks	21.2 to before 21.2R3-S8Affected 21.4 to before 21.4R3-S6Affected 22.1 to before 22.1R3-S5Affected 22.2 to before 22.2R3-S3Affected 22.3 to before 22.3R3-S2Affected 22.4 to before 22.4R2-S2, 22.4R3Affected 23.2 to before 23.2R1-S2, 23.2R2Affected

References

https://supportportal.juniper.net/JSA72300vendor-advisorymitigation
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-36851government-resource

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