CVE-2020-28220

Name: CVE-2020-28220
Creator: NVD / NIST
Published: 2020-12-11T01:15:11.94+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.8/10EPSS 1.04%

Last modified Jun 17, 2026

CVE-2020-28220 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. A CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability exists in Modicon M258 Firmware (All versions prior to V5.0.4.11) and SoMachine/SoMachine Motion software (All versions), that could cause a buffer overflow when the length of a file transferred to the webserver is not verified.. EPSS estimates a 1.04% chance of exploitation in the next 30 days.

Description

A CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability exists in Modicon M258 Firmware (All versions prior to V5.0.4.11) and SoMachine/SoMachine Motion software (All versions), that could cause a buffer overflow when the length of a file transferred to the webserver is not verified.

Metrics

CVSS 3.1

6.8/10

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

EPSS Probability

1.04%

59.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-119

Affected Software

Vendor	Product	Versions
Schneider-Electric	Modicon M258 Firmware	< 5.0.4.11
Schneider-Electric	Somachine	All versions
Schneider-Electric	Somachine Motion	All versions

References

https://www.se.com/ww/en/download/document/SEVD-2020-343-09/Vendor Advisory
https://www.se.com/ww/en/download/document/SEVD-2020-343-09/Vendor Advisory

Timeline

Published: Dec 11, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-28220?

How severe is CVE-2020-28220?

CVE-2020-28220 has a CVSS score of 6.8/10 (MEDIUM severity). The EPSS model estimates a 1.04% probability of exploitation in the next 30 days.

How do I fix CVE-2020-28220?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-28220?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST