CVE-2019-6816: Schneider Electric Modicon Quantum Firmware

Critical severity, CVSS 9.1. EPSS: 1.5% chance of exploitation in the next 30 days.

In Modicon Quantum all firmware versions, a CWE-94: Code Injection vulnerability could cause an unauthorized firmware modification with possible Denial of Service when using Modbus protocol.

Affected products

• Schneider Electric Modicon Quantum Firmware: any version

Published 2019-05-22. Last modified 2026-06-17.