CVE-2026-51218

mediumCVSS 6.5covered by 1 sourcefirst seen 2026-06-29

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.

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Exploitation outlook

Low exploitation risk0.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 22% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-51218: A heap buffer overflow in the TS7Worker::PerformFunctionWrite() function (/core/s7_server.cpp)…nvd · 2026-06-29

External references

NVD record for CVE-2026-51218

CVE.org record

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