CVE-2021-40390

Name: CVE-2021-40390
Creator: NVD / NIST
Published: 2022-04-14T20:15:08.703+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.35%

Last modified Jun 17, 2026

CVE-2021-40390 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An authentication bypass vulnerability exists in the Web Application functionality of Moxa MXView Series 3.2.4. A specially-crafted HTTP request can lead to unauthorized access. EPSS estimates a 2.35% chance of exploitation in the next 30 days.

Description

An authentication bypass vulnerability exists in the Web Application functionality of Moxa MXView Series 3.2.4. A specially-crafted HTTP request can lead to unauthorized access. An attacker can send an HTTP request to trigger this vulnerability.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.35%

81.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Moxa	Mxview	3.2.4

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1401Exploit, Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1401Exploit, Third Party Advisory

Timeline

Published: Apr 14, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-40390?

How severe is CVE-2021-40390?

CVE-2021-40390 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.35% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40390?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-40390?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST