Vulnerabilidad · Publicado 05/08/2026
nanoMODBUS versiones anteriores a v1.24.0 contiene una escritura fuera de límites en la función recv_read_device_identification_res() (FC 0x2B/MEI 0x0E) que permite a servidores Modbus remotos sobrescribir memoria del cliente. Esta vulnerabilidad afecta sistemas de automatización industrial, SCADA y dispositivos IoT en plantas manufactureras, utilities y infraestructura alta en LATAM. Un atacante en la red puede ejecutar código arbitrario o causar denial of service explotando validaciones insuficientes del campo object_length.
nanoMODBUS through v1.23.0 contains an out-of-bounds write in the Modbus client-side recv_read_device_identification_res() function (FC 0x2B/MEI 0x0E, Read Device Identification) in nanomodbus.c. The server-supplied object_length field (0-246) is validated only against the remaining PDU size (res_size_left) and is never validated against the caller-supplied buffers_length parameter. After copying data with strncpy(buffers_out[buf_index], str, buffers_length), the code unconditionally writes a NUL terminator at buffers_out[buf_index][object_length]. When a malicious or compromised Modbus server sends a response with object_length greater than or equal to the client's buffers_length, this NUL write lands past the end of the caller-provided buffer, corrupting adjacent stack or heap memory on the client.
Score: 8.6/10 — Severidad: HIGH — Estado NIST: Received
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
CWE-787
Publicado en NIST NVD.