A buffer overflow vulnerability was discovered in the OpenPLC controller, in the…
Priority MEDIUM 45CWE-119Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.
Summary
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.
Why it matters now
EPSS 0.01532 74th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:openplcproject:openplc_v2_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | OpenPLC |
| cpe:2.3:h:openplcproject:openplc_v2:-:*:*:*:*:*:*:* | not specified by NVD | Running on | OpenPLC |
| cpe:2.3:o:openplcproject:openplc_v3_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | OpenPLC |
| cpe:2.3:h:openplcproject:openplc_v3:-:*:*:*:*:*:*:* | not specified by NVD | Running on | OpenPLC |
- cpe:2.3:o:openplcproject:openplc_v2_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·OpenPLC
- cpe:2.3:h:openplcproject:openplc_v2:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·OpenPLC
- cpe:2.3:o:openplcproject:openplc_v3_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·OpenPLC
- cpe:2.3:h:openplcproject:openplc_v3:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·OpenPLC
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2018-20818
- 2026-10-03 Alias added: GHSA-j22f-7hvx-mqp8
References
Advisory 1
Sources
- CVE-2018-20818 · CVE Program
- CVE-2018-20818 · NVD
- FIRST EPSS
- GHSA-j22f-7hvx-mqp8 · GitHub Advisory Database · CC BY 4.0
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