CVE-2017-6034: Schneider Electric Modbus Firmware

Critical severity, CVSS 9.8. EPSS: 5.2% chance of exploitation in the next 30 days.

An authentication bypass by capture-replay issue was discovered in Schneider Electric Modicon Modbus Protocol. Sensitive information is transmitted in cleartext in the Modicon Modbus protocol, which may allow an attacker to replay the following commands: run, stop, upload, and download.

Affected products

Published 2017-06-30. Last modified 2026-06-17.