What is CVE-2020-6999?

CVE-2020-6999 is a medium-severity vulnerability in Moxa Mds-G516e, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.5/10. Published 2020-03-26.

How severe is CVE-2020-6999?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Buffer overflow in Moxa Mds-G516e

CVE-2020-6999

In Moxa EDS-G516E Series firmware, Version 5.2 or lower, some of the parameters in the setting pages do not ensure text is the correct size for its buffer.

Vulnerability class: Buffer Overflow

Published 2020-03-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.010 (60.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Moxa Mds-G516e
Moxa Mds-G516e Firmware
Moxa Eds-G516e Series Firmware, Version 5.2 Or Lower — versions Moxa EDS-G516E Series firmware, Version 5.2 or lower

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

www.us-cert.gov/ics/advisories/icsa-20-056-04 (US Government Resource, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-6999?: CVE-2020-6999 is a medium-severity vulnerability in Moxa Mds-G516e, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.5/10. Published 2020-03-26.
How severe is CVE-2020-6999?: Medium severity. CVSS v3 base score is 6.5 out of 10.