MXsecurity Authentication Bypass

published 2023-09-02 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-43672

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits: 0; none known

There is a vulnerability in MXsecurity versions prior to 1.0.1 that can be exploited to bypass authentication. A remote attacker might access the system if the web service authenticator has insufficient random values.

Patch / fix

fixed in 1

moxa mxsecurity 1.1.0

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: 2 y ago (2024-09-30)

Exploit prediction

0.98% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Moxa MXsecurity Series

Classification

Weakness

CWE-334 Small Space of Random Values
CWE-330 Use of Insufficiently Random Values

References

moxa.com /en/support/product-support/security-advisory/mpsa-230403-mxsecurity-series-multiple-vulnerabilities
vendor-advisory

Sources

CVE List CVE-2023-39979
NVD CVE-2023-39979

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary