Moxa MXsecurity Series Hard-coded JWT Key Authentication Bypass (CVE-2023-33236)

critical Nessus Plugin ID 176665


An OT web application uses a hard-coded JWT key.


The Moxa MXsecurity Series running on the remote host uses a hard-coded JWT key. An unauthenticated, remote attacker can exploit this, via a specially crafted message, to bypass authentication to perform otherwise restricted operations.


Upgrade to software v1.0.1 or higher.

See Also

Plugin Details

Severity: Critical

ID: 176665

File Name: moxa_mxsecurity_cve-2023-33236.nbin

Version: 1.15

Type: remote

Family: SCADA

Published: 6/5/2023

Updated: 5/20/2024

Supported Sensors: Nessus

Risk Information


Risk Factor: Medium

Score: 5.9


Risk Factor: Critical

Base Score: 10

Temporal Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2023-33236


Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:moxa:mxsecurity

Required KB Items: installed_sw/Moxa MXsecurity

Exploit Available: true

Exploit Ease: Exploits are available

Exploited by Nessus: true

Patch Publication Date: 5/22/2023

Vulnerability Publication Date: 5/22/2023

Reference Information

CVE: CVE-2023-33236

ICSA: 23-145-01

ZDI: ZDI-23-720