EUVD-2026-40244

A heap buffer overflow in the TS7Worker::PerformFunctionWrite function /core/s7server.cpp of snap7 v1.4.3 allows attackers to cause a Denial of Service DoS via a crafted packet...

PT-2020-15480 · Snap7 · Snap7

Name of the Vulnerable Software and Affected Versions: Snap7 version 1.4.1 Description: The issue occurs when an attacker sends a crafted packet using the COTP protocol with the last-data-unit flag set to No, and the S7 function writes a variable. This results in the Snap7 server crashing...