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.

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)

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.

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.