The document discusses a security vulnerability found in Schneider Electric Modbus serial communication modules, specifically the Modicon M221, M241, and M251, which could allow an attacker to remotely execute code on the targeted device. The vulnerability is due to insufficient validation of user-supplied inputs, allowing for an unauthenticated attacker to exploit it. Various versions of firmware are affected by this vulnerability, and the document recommends updating to the latest version to mitigate the risk
Additionally, the document provides details on the impact of the vulnerability and suggests security measures to protect against potential attacks targeting the affected systems. Overall, the document serves as a warning to users and administrators about the importance of ensuring the security of industrial control systems and the potential risks associated with unpatched vulnerabilities. https://www.cert.ssi.gouv.fr/pdf/CERTFR-2024-AVI-0418.pdf