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CVE-2023-39979

28
FAUCET Score

CVE-2023-39979 is a critical authentication bypass vulnerability affecting Moxa MXsecurity versions prior to 1.0.1. The flaw, stemming from insufficient random values in the web service authenticator (CWE-330, CWE-334), allows a remote attacker to gain unauthorized access to the system. With a CVSS score of 9.8 (Critical), this vulnerability has a high impact on confidentiality, integrity, and availability, requiring no user interaction or privileges for exploitation. Currently, there is no public exploit code available, and it is not listed on the KEV catalog, nor is there significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.1.0CPE matchmatch criteria
cpe:2.3:a:moxa:mxsecurity:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.74%
Probability of exploitation in next 30 days
EPSS Percentile
50.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0074 is in the 34th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

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