What’s Vulnerable › Vulnerabilities

CVE-2020-7559

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-11-19 · updated 2026-06-17
• Weakness: CWE-120

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.

Affected products

• Schneider Electric EcoStruxure Control Expert: all versions

References

• https://www.se.com/ww/en/download/document/SEVD-2020-315-07
• https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1140
• https://www.se.com/ww/en/download/document/SEVD-2020-315-07
• https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1140

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