CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability exists that could cause a potential arbitrary code execution after a successful Man-In-The-Middle attack followed by sending a crafted Modbus function call to tamper with memory area involved in memory size computation.

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability exists that could cause a potential arbitrary code execution after a successful Man-In-The-Middle attack followed by sending a crafted Modbus function call to tamper with memory area involved in memory size computation.

Schneider Electric is aware of multiple vulnerabilities in its Modicon Controllers M340 / Momentum / MC80 products.Modicon PAC control and monitor industrial operations.Failure to apply the provided remediations/mitigations below may risk unauthorized access to the controller, which could result in the possibility of denial of service and loss of confidentiality, integrity of the controller.January 2026 Update: Remediation is now available for Modicon MC80.

Schneider Electric is aware of multiple vulnerabilities in its Modicon Controllers M340 / Momentum / MC80 products.Modicon PAC control and monitor industrial operations.Failure to apply the provided remediations/mitigations below may risk unauthorized access to the controller, which could result in the possibility of denial of service and loss of confidentiality, integrity of the controller.January 2026 Update: Remediation is now available for Modicon MC80.