What is CVE-2021-47770?

CVE-2021-47770 is a high-severity vulnerability in Autonomy Openplc, classified under Code Injection. CVSS score: 8.8/10. Published 2026-01-21.

How severe is CVE-2021-47770?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Autonomy Openplc

CVE-2021-47770

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.

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.006 (46.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Autonomy Openplc — versions OpenPLC v3

Weakness classification (CWE)

CWE-94 — Code Injection

References

ExploitDB-49803 (exploit)
OpenPLC Project Official Homepage (product)
OpenPLC v3 GitHub Repository (product)
VulnCheck Advisory: OpenPLC 3 - Remote Code Execution (third-party-advisory)

Frequently asked questions

What is CVE-2021-47770?: CVE-2021-47770 is a high-severity vulnerability in Autonomy Openplc, classified under Code Injection. CVSS score: 8.8/10. Published 2026-01-21.
How severe is CVE-2021-47770?: High severity. CVSS v3 base score is 8.8 out of 10.