CVE-2020-7559 Memory corruption in PLC Simulator on EcoStruxureª Control Expert (now Unity Pro) (all versions)

High 7.5 Published 19 Nov 2020 Updated 4 Aug 2024

A buffer overflow in the EcoStruxure Control Expert PLC Simulator allows attackers to cause a denial of service via crafted Modbus requests.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-7559?

CVE-2020-7559 is a high-severity memory corruption vulnerability in PLC Simulator on EcoStruxureª Control Expert (now Unity Pro) (all versions), published on 19 Nov 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-120

Which versions are affected by CVE-2020-7559?

It affects 1 product.

Products include Schneider-Electric Ecostruxure Control Expert.

How do I fix CVE-2020-7559?

No fix has been published for CVE-2020-7559 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2020-7559 being exploited?

There is no known exploitation of CVE-2020-7559 in the wild and no public exploit code.

Sources

Also known as GHSA-28rp-9f44-h4v6.