Critical severity9.8NVD Advisory· Published Apr 22, 2019· Updated Jun 17, 2026
CVE-2018-20818
CVE-2018-20818
Description
A buffer overflow vulnerability was discovered in the OpenPLC controller, in the OpenPLC_v2 and OpenPLC_v3 versions. It occurs in the modbus.cpp mapUnusedIO() function, which can cause a runtime crash of the PLC or possibly have unspecified other impact.
Affected products
4- cpe:2.3:o:openplcproject:openplc_v2_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:openplcproject:openplc_v3_firmware:-:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
1- arxiv.org/pdf/1809.07477nvdThird Party Advisory
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