PT-2026-53751 · Snap7 · Snap7

Gff-Cw · Published 2026-06-29 · Updated 2026-06-30 · CVE-2026-51218

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

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.

Exploit

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

CVE-2026-51218

Affected Products

Snap7

References · 4

• 🔥 https://github.com/davenardella/snap7/issues/14 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-51218 · Security Note
• https://github.com/davenardella/snap7 · Note
• https://twitter.com/VulmonFeeds/status/2071745958514229278 · Twitter Post