CVE-2026-51218

MEDIUM

snap7 1.4.3 - Denial of Service via TS7Worker::PerformFunctionWrite()

Title source: llm

Description

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.

References (2)

Core 2

Core References

https://github.com/davenardella/snap7

View Writeup ZIP pw:eip

https://github.com/davenardella/snap7/issues/14

Scores

CVSS v3 6.5

EPSS 0.0030

EPSS Percentile 22.0%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact partial

Details

CWE

CWE-122

Status published

Published Jun 29, 2026

Tracked Since Jun 30, 2026