CVE-2025-41696

MEDIUM

Phoenix Contact FL Switch Firmware < 3.50 - Unauthenticated Filesystem Access via UART Port

Title source: llm
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 4.6
EPSS 0.0018
EPSS Percentile 7.4%
Attack Vector PHYSICAL
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-798
Status published
Products (50)
phoenixcontact/fl_nat_2008_firmware < 3.50
phoenixcontact/fl_nat_2208_firmware < 3.50
phoenixcontact/fl_nat_2304-2gc-2sfp_firmware < 3.50
phoenixcontact/fl_switch_2005_firmware < 3.50
phoenixcontact/fl_switch_2008_firmware < 3.50
phoenixcontact/fl_switch_2008f_firmware < 3.50
phoenixcontact/fl_switch_2016_firmware < 3.50
phoenixcontact/fl_switch_2105_firmware < 3.50
phoenixcontact/fl_switch_2108_firmware < 3.50
phoenixcontact/fl_switch_2116_firmware < 3.50
... and 40 more
Published Dec 09, 2025
Tracked Since Feb 18, 2026