CVE-2025-41696
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-09

Last updated on: 2025-12-09

Assigner: CERT VDE

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.
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Meta Information
Published
2025-12-09
Last Modified
2025-12-09
Generated
2026-06-16
AI Q&A
2025-12-09
EPSS Evaluated
2026-06-15
NVD
CVE-2025-41696
EUVD
EUVD-2025-201890
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
phoenix_contact fl_switch 3.50
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-798 The product contains hard-coded credentials, such as a password or cryptographic key.
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Executive Summary

This vulnerability involves an attacker exploiting an undocumented UART port on the device's PCB as a side-channel. Using hardcoded user credentials obtained from a related vulnerability (CVE-2025-41692), the attacker can gain read access to parts of the device's filesystem.

Impact Analysis

The vulnerability allows an attacker to read sensitive parts of the device's filesystem without authorization, potentially exposing confidential data or system information, which could lead to further exploitation or data breaches.

Mitigation Strategies

To mitigate this vulnerability, users should update the firmware of the affected Phoenix Contact FL SWITCH 2xxx series devices to version 3.50 or later, as this version resolves CVE-2025-41692 and related vulnerabilities. This update helps prevent unauthorized access via the undocumented UART port and hardcoded credentials. [1]

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