CVE-2026-51218

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

A heap buffer overflow in the TS7Worker::PerformFunctionWrite() function (/core/s7_server.cpp) of snap7 v1.4.3 allows attackers to cause a Denial of Service (DoS) via a crafted packet.

Published 2026-06-29. Last modified 2026-07-30.