Unauthorized Access Vulnerability in PCB Devices by Certain Vendors
CVE-2025-41696

4.6MEDIUM

Key Information:

Vendor

Phoenix Contact

Status
Fl Switch 2005
Fl Switch 2008
Fl Switch 2016
Fl Switch 2105
Vendor
CVE Published:
9 December 2025

What is CVE-2025-41696?

An undocumented UART port present on certain PCB devices can be exploited by an attacker to access user hardcoded credentials. By leveraging these credentials, an attacker can read sensitive parts of the device's filesystem, potentially exposing confidential information and compromising the device's integrity. This highlights the importance of securing hardware interfaces and implementing proper credential management.

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Affected Version(s)

FL NAT 2008 0.0.0 < 3.50

FL NAT 2208 0.0.0 < 3.50

FL NAT 2304-2GC-2SFP 0.0.0 < 3.50

References

https://certvde.com/de/advisories/VDE-2025-071

CVSS V3.1

Score:
4.6
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Physical
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

D. Blagojevic, S. Dietz, F. Koroknai, T. Weber from CyberDanube
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