CVE intelligence and bounded remediation

CVE-2025-41696 — Phoenixcontact Fl Switch 2708 Pn Firmware security vulnerability

Medium CVSS 4.6

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.

Severity
Medium
CVSS
4.6 (3.1)
Published
2025-12-09
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-798

Affected products

  • phoenixcontact / fl_switch_2708_pn_firmware
  • phoenixcontact / fl_switch_2708_firmware
  • phoenixcontact / fl_switch_2608_pn_firmware
  • phoenixcontact / fl_switch_2608_firmware
  • phoenixcontact / fl_switch_2516_pn_firmware
  • phoenixcontact / fl_switch_2516_firmware

Showing 6 representative product identities from 69 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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