CVE-2025-41693 Authenticated Denial-of-Service via SSH

Medium 4.3 Published 9 Dec 2025 Updated 9 Dec 2025

Authenticated low-privilege users can cause resource exhaustion via SSH, degrading management performance on Phoenix Contact industrial switches.

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-2025-41693?

CVE-2025-41693 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 use the ssh feature to execute commands directly after login. The process stays open and uses resources which leads to a reduced performance of the management functions. Switching functionality is not affected.

Weakness: CWE-770

Which versions are affected by CVE-2025-41693?

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-2025-41693?

No fix has been published for CVE-2025-41693 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-2025-41693 being exploited?

There is no known exploitation of CVE-2025-41693 in the wild and no public exploit code.

Sources

Also known as GHSA-q7f9-7f36-x3ch.