CVE-2018-20818

9.8 criticalEPSS 1.5%

Critical (9.8) in openplcproject. EPSS 1.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.0

9.8 critical

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 1.5% chance of exploitation in the next 30 days; higher than 74% of CVEs (scores of 2026-10-31)
CWE: CWE-119
Published: 2019-04-22
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

openplcproject:openplc_v2_firmware
openplcproject:openplc_v3_firmware

References

https://arxiv.org/pdf/1809.07477
https://arxiv.org/pdf/1809.07477

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