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Vulnerability record · CVE-2021-47770 · published 21 January 2026

CVE-2021-47770: Code injection vulnerability

OpenPLC v3 contains an authenticated remote code execution vulnerability that allows attackers with valid credentials to inject malicious code through the hardware configuration interface. Attackers can upload a custom hardware layer with embedded reverse shell code that establishes a network connection to a specified IP and port, enabling remote command execution.

8.6 CVSS 4.0 High EPSS 0.74% · top 47.4% CWE-94 · Code injection Deferred
8.6CVSS 4.0 base score
0.74%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

OpenPLC v3 contains an authenticated remote code execution vulnerability that allows attackers with valid credentials to inject malicious code through the hardware configuration interface. Attackers can upload a custom hardware layer with embedded reverse shell code that establishes a network connection to a specified IP and port, enabling remote command execution.

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/thiagoralves/OpenPLC_v3
https://www.exploit-db.com/exploits/49803
https://www.openplcproject.com/
https://www.vulncheck.com/advisories/openplc-remote-code-execution

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Source: NIST National Vulnerability Database (record CVE-2021-47770), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.