CVE-2025-41694 Authenticated Denial-of-Service via Webshell

Medium 6.5 Published 9 Dec 2025 Updated 9 Dec 2025

A low-privileged attacker can cause a denial of service on Phoenix Contact network devices by sending an empty command to the webshell.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-41694?

CVE-2025-41694 is a medium-severity denial of service vulnerability in Phoenix Contact FL NAT 2008, published on 9 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A low privileged remote attacker can run the webshell with an empty command containing whitespace. The server will then block until it receives more data, resulting in a DoS condition of the websserver.

Weakness: CWE-770

Which versions are affected by CVE-2025-41694?

It affects 69 products.

Products include Phoenixcontact Fl Nat 2008 Firmware, Phoenixcontact Fl Nat 2208 Firmware, Phoenixcontact Fl Nat 2304-2gc-2sfp Firmware, Phoenixcontact Fl Switch 2005 Firmware, Phoenixcontact Fl Switch 2008 Firmware, Phoenixcontact Fl Switch 2008f Firmware and 63 more.

How do I fix CVE-2025-41694?

No fix has been published for CVE-2025-41694 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-2025-41694 being exploited?

There is no known exploitation of CVE-2025-41694 in the wild and no public exploit code.

Sources

Also known as GHSA-56w8-9x5w-fmh9.