# CVE-2021-31384

## Summary

- **CVE ID:** CVE-2021-31384
- **Severity:** HIGH
- **CVSS Score:** 7.2 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N)
- **CWE:** CWE-285, CWE-862, CWE-551, CWE-939, CWE-1220
- **Published:** Oct 19, 2021
- **Last Modified:** Mar 13, 2026

## Description

Due to a Missing Authorization weakness and Insufficient Granularity of Access Control in a specific device configuration, a vulnerability exists in Juniper Networks Junos OS on SRX Series whereby an attacker who attempts to access J-Web administrative interfaces can successfully do so from any device interface regardless of the web-management configuration and filter rules which may otherwise protect access to J-Web. This issue affects: Juniper Networks Junos OS SRX Series 20.4 version 20.4R1 and later versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2. This issue does not affect Juniper Networks Junos OS versions prior to 20.4R1.

## Affected Products

- Juniper Networks — Junos OS (unspecified)
- Juniper Networks — Junos OS (20.4R1)
- Juniper Networks — Junos OS (21.1)

## References

- [CNA](https://kb.juniper.net/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.36%
- **EPSS Percentile:** 58.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._