CVE-2020-7498: Schneider Electric OS Loader

Critical severity, CVSS 9.8. EPSS: 1.4% chance of exploitation in the next 30 days.

A CWE-798: Use of Hard-coded Credentials vulnerability exists in the Unity Loader and OS Loader Software (all versions). The fixed credentials are used to simplify file transfer. Today the use of fixed credentials is considered a vulnerability, which could cause unauthorized access to the file transfer service provided by the Modicon PLCs. This could result in various unintended results.

Affected products

• Schneider Electric OS Loader: any version
• Schneider Electric Unity Loader: any version

Published 2020-06-16. Last modified 2026-06-17.