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Vulnerability record · CVE-2026-51218 · published 29 June 2026

CVE-2026-51218: Heap-based buffer overflow vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.57% · top 55.1% CWE-122 · Heap-based buffer overflow Deferred
7.5CVSS 3.1 base score
0.57%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
30 Jul 2026Last modified by NVD

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.

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

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-51218), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.