CVE-2021-42705 WECON PLC Editor

High 7.8 Published 22 Nov 2021 Updated 16 Sep 2024

A stack-based buffer overflow in WECON PLC Editor allows attackers to execute arbitrary code via malicious project files.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2021-42705?

CVE-2021-42705 is a high-severity memory corruption vulnerability in WECON PLC Editor, published on 22 Nov 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

PLC Editor Versions 1.3.8 and prior is vulnerable to a stack-based buffer overflow while processing project files, which may allow an attacker to execute arbitrary code.

Weakness: CWE-121

Which versions are affected by CVE-2021-42705?

It affects 1 product.

Products include We-Con Plc Editor.

How do I fix CVE-2021-42705?

No fix has been published for CVE-2021-42705 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-2021-42705 being exploited?

There is no known exploitation of CVE-2021-42705 in the wild and no public exploit code.

Sources

Also known as GHSA-2rh6-6g57-x8rx.