Is CVE-2021-31384 actively exploited?

No active exploitation of CVE-2021-31384 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-31384 be exploited remotely?

Yes. CVE-2021-31384 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-31384?

CVE-2021-31384 has a CVSS score of 10.0 (CRITICAL).

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CRITICAL

CVE-2021-31384

CWE-285Published: October 19, 2021· Updated: Jun 17, 2026

10.0

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-31384 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 10.0.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.