The vulnerability of the Modbus protocol implementation in Schneider Electric’s programmable logic controllers (PLCs), such as the Modicon M340 CPU BMXP34, Modicon MC80 BMKC80, and Modicon Momentum Unity M1E Processor 171CBU, allows a attacker to execute a “man-in-the-middle” attack.

The vulnerability of the Modbus protocol implementation in Schneider Electric’s programmable logic controllers PLCs such as Modicon M340 CPU BMXP34, Modicon MC80 BMKC80, and Modicon Momentum Unity M1E Processor 171CBU lies in the execution of operations outside the buffer in memory. Exploiting th...