CVE-2026-15105

A flaw has been found in davenardella snap7 up to 1.4.3. This affects the function TS7Worker::PerformFunctionRead of the file src/core/s7server.cpp of the component ReadVar Request Handler. This manipulation causes deserialization. The attack requires access to the local network. The exploit has...

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...

CVE-2026-51218

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

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...