CVE-2025-41705

Phoenix Contact QUINT4 — vulnerability CVE-2025-41705

An unauthenticated remote attacker (MITM) can intercept the websocket messages to gain access to the login credentials for the Webfrontend.

CVSS 6.8No patch available

This record: live connection— last retrieved: 7 November 2026 at 01:04.

Vendor

Phoenix Contact

Product

QUINT4

up to version VC:00<VC:07

Published

14 October 2025

Last modified

18 October 2026

Original source information

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

Technical description

An unauthenticated remote attacker (MITM) can intercept the websocket messages to gain access to the login credentials for the Webfrontend.

CVSS 3.1 — vector details

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

Attack vector

NETWORK

Privileges required

NONE

User interaction

REQUIRED

Confidentiality

High

Integrity

High

Availability

None

EPSS — Exploit Prediction Scoring System

Probability of exploitation within 30 days

0.5%

Percentile

40e

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

Patch information

This product was designed for use in closed industrial networks. Phoenix Contact strongly recommends operating network-capable devices in closed networks or protected with a suitable firewall. For detailed information on our recommendations for measures to protect network-capable devices, please refer to our [application note](https://dam-mdc.phoenixcontact.com/asset/156443151564/0a870ae433c19148b80bd760f3a1c1f2/107913_en_03.pdf).

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 0.5%, 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.
•No valid credentials are needed.
•User interaction (for example opening a file) is 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.

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.

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.

Loading vulnerabilities…