CVE-2025-41703 Phoenix Contact: UPS Shutdown via Unauthenticated Modbus Command
Unauthenticated attackers can shut down industrial UPS units via Modbus, causing denial of service in operational environments.
- 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-2025-41703?
CVE-2025-41703 is a high-severity missing authorization 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 unauthenticated remote attacker can cause a Denial of Service by turning off the output of the UPS via Modbus command.
Weakness: CWE-306
Which versions are affected by CVE-2025-41703?
How do I fix CVE-2025-41703?
No fix has been published for CVE-2025-41703 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2025-41703 being exploited?
There is no known exploitation of CVE-2025-41703 in the wild and no public exploit code.
Sources
Also known as GHSA-gv4w-qrcx-c827.