CVE-2021-47770 OpenPLC 3 - Remote Code Execution
Authenticated attackers can inject malicious code via the hardware configuration interface in OpenPLC 3 to achieve remote code execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-47770?
CVE-2021-47770 is a high-severity code injection vulnerability in Autonomy OpenPLC, published on 21 Jan 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-94
Which versions are affected by CVE-2021-47770?
How do I fix CVE-2021-47770?
No fix has been published for CVE-2021-47770 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2021-47770 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47770 exists.
Sources
Also known as GHSA-grvf-xrw5-jxhc.