CVE-2020-28212 Auth bypass in PLC Simulator on EcoStruxureª Control Expert (now Unity Pro) (all versions)

Critical 9.8 Published 19 Nov 2020 Updated 4 Aug 2024

Attackers can execute unauthorized commands via brute force attacks on Modbus due to missing authentication attempt restrictions in the PLC Simulator.

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-2020-28212?

CVE-2020-28212 is a critical authentication bypass 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-307: Improper Restriction of Excessive Authentication Attempts vulnerability exists in PLC Simulator on EcoStruxureª Control Expert (now Unity Pro) (all versions) that could cause unauthorized command execution when a brute force attack is done over Modbus.

Weakness: CWE-307

Which versions are affected by CVE-2020-28212?

It affects 1 product.

Products include Schneider-Electric Ecostruxure Control Expert.

How do I fix CVE-2020-28212?

No fix has been published for CVE-2020-28212 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2020-28212 being exploited?

There is no known exploitation of CVE-2020-28212 in the wild and no public exploit code.

Sources

Also known as GHSA-6pcj-rq2g-gx86.