What is CVE-2023-27389?

CVE-2023-27389 is a high-severity vulnerability in Contec Cps-Mc341-A1-111, classified under Inadequate Encryption Strength. CVSS score: 7.2/10. Published 2023-04-11.

How severe is CVE-2023-27389?

High severity. CVSS v3 base score is 7.2 out of 10.

Is CVE-2023-27389 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Contec Cps-Mc341-A1-111

CVE-2023-27389

Inadequate encryption strength vulnerability in CONPROSYS IoT Gateway products allows a remote authenticated attacker with an administrative privilege to apply a specially crafted Firmware update file, alter the information, cause a denial-of-service (DoS) condition, and/or execute arbitrary code. The affected products and versions are as follows: M2M Gateway with the firmware Ver.3.7.10 and earlier (CPS-MG341-ADSC1-111, CPS-MG341-ADSC1-931, CPS-MG341G-ADSC1-111, CPS-MG341G-ADSC1-930, and CPS-MG341G5-ADSC1-931), M2M Controller Integrated Type with firmware Ver.3.7.6 and earlier versions (CPS-MC341-ADSC1-111, CPS-MC341-ADSC1-931, CPS-MC341-ADSC2-111, CPS-MC341G-ADSC1-110, CPS-MC341Q-ADSC1-111, CPS-MC341-DS1-111, CPS-MC341-DS11-111, CPS-MC341-DS2-911, and CPS-MC341-A1-111), and M2M Controller Configurable Type with firmware Ver.3.8.8 and earlier versions (CPS-MCS341-DS1-111, CPS-MCS341-DS1-131, CPS-MCS341G-DS1-130, CPS-MCS341G5-DS1-130, and CPS-MCS341Q-DS1-131).

Published 2023-04-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (42.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-326 — Inadequate Encryption Strength

Public proof-of-concept exploits

References

www.contec.com/api/downloadlogger (Mitigation, Vendor Advisory)
www.contec.com/download/donwload-list/ (Product)
www.contec.com/download/donwload-list/ (Product)
www.contec.com/download/donwload-list/ (Product)
jvn.jp/en/vu/JVNVU96198617/ (Third Party Advisory)

Frequently asked questions

What is CVE-2023-27389?: CVE-2023-27389 is a high-severity vulnerability in Contec Cps-Mc341-A1-111, classified under Inadequate Encryption Strength. CVSS score: 7.2/10. Published 2023-04-11.
How severe is CVE-2023-27389?: High severity. CVSS v3 base score is 7.2 out of 10.
Is CVE-2023-27389 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.