CVE-2025-41696 Hardcoded User Password

Medium 4.6 Published 9 Dec 2025 Updated 9 Dec 2025

Attackers with physical access can use hardcoded credentials via UART to read device filesystem data.

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-2025-41696?

CVE-2025-41696 is a medium-severity vulnerability in Phoenix Contact FL NAT 2008, published on 9 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An attacker can use an undocumented UART port on the PCB as a side-channel with the user hardcoded credentials obtained from CVE-2025-41692 to gain read access to parts of the filesystem of the device.

Weakness: CWE-798

Which versions are affected by CVE-2025-41696?

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-2025-41696?

No fix has been published for CVE-2025-41696 yet. Limit exposure of the affected software until one is available.

Is CVE-2025-41696 being exploited?

There is no known exploitation of CVE-2025-41696 in the wild and no public exploit code.

Sources

Also known as GHSA-chp3-94cp-3c98.