CVE-2025-54811 OpenPLC_V3
Remote unauthenticated attackers can crash the OpenPLC runtime by triggering a specific server loop condition, halting automation logic.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-54811?
CVE-2025-54811 is a medium-severity denial of service vulnerability in OpenPLC_V3, published on 1 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
OpenPLC_V3 has a vulnerability in the enipThread function that occurs due to the lack of a return value. This leads to a crash when the server loop ends and execution hits an illegal ud2 instruction. This issue can be triggered remotely without authentication by starting the same server multiple times or if the server exits unexpectedly. The vulnerability allows an attacker to cause a Denial of Service (DoS) against the PLC runtime, stopping any PC started remotely without authentication. This results in the PLC process crashing and halting all automation or control logic managed by OpenPLC.
Weakness: CWE-758
Which versions are affected by CVE-2025-54811?
How do I fix CVE-2025-54811?
No fix has been published for CVE-2025-54811 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-54811 being exploited?
There is no known exploitation of CVE-2025-54811 in the wild and no public exploit code.
Sources
Also known as GHSA-v57j-j5hj-cgf3.