CVE-2025-41704 Phoenix Contact: Unauthenticated Modbus Service DoS via Crafted Function Code
Unauthenticated remote attackers can cause a denial of service on the Modbus service of Phoenix Contact UPS devices by sending crafted function codes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-41704?
CVE-2025-41704 is a medium-severity denial of service vulnerability in Phoenix Contact QUINT4-UPS/24DC/24DC/10/EIP, published on 14 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An unauthanticated remote attacker can perform a DoS of the Modbus service by sending a specific function and sub-function code without affecting the core functionality.
Weakness: CWE-770
Which versions are affected by CVE-2025-41704?
How do I fix CVE-2025-41704?
No fix has been published for CVE-2025-41704 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-2025-41704 being exploited?
There is no known exploitation of CVE-2025-41704 in the wild and no public exploit code.
Sources
Also known as GHSA-qvxv-3qg9-53cr.