A CWE-191: Integer Underflow (Wrap or Wraparound) vulnerability exists that could cause a denial of service of the controller due to memory access violations when using the Modbus TCP protocol. Affected products: Modicon M340 CPU (part numbers BMXP34)(V3.40 and prior), Modicon M580 CPU (part numbers BMEP and BMEH)(V3.22 and prior), Legacy Modicon Quantum/Premium(All Versions), Modicon Momentum MDI (171CBU)(All Versions), Modicon MC80 (BMKC80)(V1.7 and prior)

The Schneider Electric M340 BMXNOE01xx and BMXP3420xx PLC modules allow remote authenticated users to cause a denial of service (module crash) via crafted FTP traffic, as demonstrated by the FileZilla FTP client.

Cross-site request forgery (CSRF) vulnerability on the Schneider Electric Quantum 140NOE77111, 140NOE77101, and 140NWM10000; M340 BMXNOC0401, BMXNOE0100x, and BMXNOE011xx; and Premium TSXETY4103, TSXETY5103, and TSXWMY100 PLC modules allows remote attackers to hijack the authentication of arbitrary users for requests that execute commands, as demonstrated by modifying HTTP credentials.

A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in BMXNOR0200H Ethernet / Serial RTU module (all firmware versions) and Modicon M340 controller (all firmware versions), which could cause denial of service when truncated SNMP packets on port 161/UDP are received by the device.