Vulnerability 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 Score
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Related Weaknesses (CWE)
References
- https://github.com/davenardella/snap7
- https://github.com/davenardella/snap7/issues/14
- https://github.com/davenardella/snap7/issues/14
FAQ
What is CVE-2026-51218?
CVE-2026-51218 is a vulnerability with a CVSS score of 7.5 (HIGH). 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.
How severe is CVE-2026-51218?
CVE-2026-51218 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-51218?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.