CVE-2026-51218

Name of the Vulnerable Software and Affected Versions snap7 version 1.4.3

Description A heap buffer overflow occurs in the TS7Worker::PerformFunctionWrite() function located in /core/s7 server.cpp. This issue allows an attacker to trigger a Denial of Service (DoS) by sending a specially crafted packet. A heap buffer overflow is a condition where a program writes more data to a heap-allocated memory block than it can hold, potentially corrupting memory.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.