# CVE-2023-36851: Junos OS: SRX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload and download arbitrary files

> CVE-2023-36851: Junos OS: SRX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload and download arbitrary files. CVSS 5.3 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2023-36851
Last updated: 2025-10-21T23:05:36Z

- Published: 2023-09-26 19:53 UTC · Updated: 2025-10-21 23:05 UTC · Assigner: juniper
- CVSS: 5.3 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- EPSS: 1.1%, 66th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2023-11-13, federal due date 2023-11-17, ransomware use: Unknown
- CWE: CWE-306

## 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.

## CISA required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

## Affected vendors and products

- Juniper Networks: Junos OS

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2023-36851)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2023-36851)
- [https://supportportal.juniper.net/JSA72300](https://supportportal.juniper.net/JSA72300)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2023-36851 · Markdown: https://rewindex.com/cve/CVE-2023-36851.md · JSON: https://rewindex.com/api/v1/cves/CVE-2023-36851 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:34.436Z