What is CVE-2020-12117?

CVE-2020-12117 is a medium-severity vulnerability in Moxa Nport 5100a, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2020-05-01.

How severe is CVE-2020-12117?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Auth bypass in Moxa Nport 5100a

CVE-2020-12117

Moxa Service in Moxa NPort 5150A firmware version 1.5 and earlier allows attackers to obtain sensitive configuration values via a crafted packet to UDP port 4800. NOTE: Moxa Service is an unauthenticated service that runs upon a first-time installation but can be disabled without ill effect.

Vulnerability class: Broken Authentication

Published 2020-05-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.014 (71.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

www.moxa.com/en/support/support/security-advisory/nport-5100a-series-serial-dev… (Patch, Vendor Advisory)
blog.scadafence.com/technical-blog-cve-2020-12117-industrial-iot-insecure-defau… (Third Party Advisory)

Frequently asked questions

What is CVE-2020-12117?: CVE-2020-12117 is a medium-severity vulnerability in Moxa Nport 5100a, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2020-05-01.
How severe is CVE-2020-12117?: Medium severity. CVSS v3 base score is 5.3 out of 10.