CVE-2025-41692

Phoenix Contact FL SWITCH — vulnerability CVE-2025-41692

A high privileged remote attacker with admin privileges for the webUI can brute-force the "root" and "user" passwords of the underlying OS due to a weak password generation algorithm.

CVSS 6.8Patch available

This record: live connection— last retrieved: 7 November 2026 at 01:34.

Vendor

Phoenix Contact

Products

FL SWITCH, FL NAT

up to version vers:generic/<3.50

Published

9 December 2025

Last modified

7 October 2026

Original source information

Taken directly from NVD, CISA or the vendor — sometimes in English, unchanged from the source.

Technical description

A high privileged remote attacker with admin privileges for the webUI can brute-force the "root" and "user" passwords of the underlying OS due to a weak password generation algorithm.

CVSS 3.1 — vector details

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N

Attack vector

NETWORK

Privileges required

HIGH

User interaction

NONE

Confidentiality

High

Integrity

None

Availability

None

EPSS — Exploit Prediction Scoring System

Probability of exploitation within 30 days

0.3%

Percentile

22e

Source: FIRST.org, updated on 6 November 2026.

Patch information

Phoenix Contact strongly recommends to upgrade to firmware 3.50 which addresses this vulnerability and is available for download for all affected devices.

IACS Radar assessment

Our own interpretation and context for the source data above.

IACS Radar assessment

Our own interpretation and context for this vulnerability — not an official source.

IACS Radar priority score

43/ 100

Based on CVSS 6.8, EPSS 0.3%, industrial relevance 55/100.

Combines CVSS, EPSS, KEV status, industrial relevance and exposure relevance — a complement to, not a replacement for, the individual scores below and above.

Conditions for exploitation

•Network access to the affected device or segment is required.
•Limited user privileges are required.
•No user interaction required.

Operational impact & energy relevance

Limited impact on availability; the risk lies mainly with confidentiality or integrity of process data.

Assessed as relevant to the energy sector based on: Vermeld in een officiële CISA ICS Advisory, wat directe relevantie voor industriële besturingssystemen bevestigt. Vendor "Phoenix Contact" is a known supplier of equipment for the energy sector. Sector indication recognised in the description: energieopwekking.

Recommended defensive measures

•Apply the latest firmware or software update and validate its integrity.
•Restrict network access to the affected device to a dedicated OT management segment.
•Implement network segmentation in line with zones and conduits (IEC 62443-3-2).
•Monitor for abnormal protocol traffic using an OT-aware detection system.

Industrial relevance score

55/ 100

• Mentioned in an official CISA ICS advisory, which confirms direct relevance to industrial control systems.
• Vendor "Phoenix Contact" is a known supplier of equipment for the energy sector.
• Sector indication recognised in the description: energieopwekking.

Classification is provisional; manual verification by an OT security analyst is recommended.

Classified by IACS Radar-analysepijplijn (geautomatiseerd) on 7 November 2026.

IEC 62443 mapping

IEC 62443-4-1FR3 · Systeemintegriteit

Automatic IACS Radar assessment based on the reported CWE weakness classification; not an official certification statement.

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