CVE-2020-28220

What it is

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.

At a glance

Exploitability

Can be exploited from the same network segment with an admin-level account. High risk of data exposure, data tampering, service disruption.

Exploit odds

1.1% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2020-12-11 01:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:10 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.1% in the next 30 days (EPSS).
• Severity: 6.8 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2020-12-11 01:15 UTC

Last modified

2026-06-17 03:10 UTC

Exploit probability

1.1% · EPSS, next 30 days

Weakness

CWE-119 · Buffer errors

Record status

Modified

Affected

• schneider-electric Modicon m258 Firmware < 5.0.4.11
• schneider-electric Somachine
• schneider-electric Somachine Motion

Attack profile CVSS 3.1 · 6.8

Attack vector

Adjacent network

Complexity

Low

Privileges needed

High

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2020-28220.md and follow it. Check whether this project is affected by CVE-2020-28220. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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