CVE-2020-7559

Name: CVE-2020-7559
Creator: NVD / NIST
Published: 2020-11-19T22:15:14.8+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.88%

Last modified Jun 17, 2026

CVE-2020-7559 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability exists in PLC Simulator on EcoStruxureª Control Expert (now Unity Pro) (all versions) that could cause a crash of the PLC simulator present in EcoStruxureª Control Expert software when receiving a specially crafted request over Modbus.. EPSS estimates a 1.88% chance of exploitation in the next 30 days.

Description

A CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability exists in PLC Simulator on EcoStruxureª Control Expert (now Unity Pro) (all versions) that could cause a crash of the PLC simulator present in EcoStruxureª Control Expert software when receiving a specially crafted request over Modbus.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.88%

76.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-120

Affected Software

Vendor	Product	Versions
Schneider-Electric	Ecostruxure Control Expert	All versions

References

https://www.se.com/ww/en/download/document/SEVD-2020-315-07Patch, Product, Vendor Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1140Exploit, Third Party Advisory
https://www.se.com/ww/en/download/document/SEVD-2020-315-07Patch, Product, Vendor Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1140Exploit, Third Party Advisory

Timeline

Published: Nov 19, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-7559?

How severe is CVE-2020-7559?

CVE-2020-7559 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.88% probability of exploitation in the next 30 days.

How do I fix CVE-2020-7559?

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-2020-7559?

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

Scan your code now

Source: NVD / NIST