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Medium VDE-2026-046 1 CVE

VEGA: Missing Authentication for critical function in VEGAPULS two- and four-wire products

Published May 4, 2026 · Updated Oct 2, 2026 · Revision 4

Vendor: vega Product: CVE Reference Score Product: VEGAPULS 21 Two-wire 4_20 mA/HART Product: VEGAPULS 31 Two-wire 4_20 mA/HART Product: VEGAPULS 42 Three-wire IO-Link, Transistor, 4_20 mA Product: VEGAPULS 6X Four-wire 4_20 mA/HART; 9.6_48 V DC; 20_42 V AC Product: VEGAPULS 6X Four-wire 4_20 mA/HART; 90_253 V AC; 50/60 Hz Product: VEGAPULS 6X Four-wire Modbus Product: VEGAPULS 6X Two-wire 4_20 mA/HART Product: VEGAPULS 6X Two-wire 4_20 mA/HART plus second current output 4_20 mA Product: VEGAPULS 6X Two-wire 4_20 mA/HART with overvoltage protection (Not for Ex Zone 0, 20; not for Div 1) Product: VEGAPULS 6X Two-wire EtherNet/IP, Modbus TCP, OPC UA (Ethernet-APL) Product: VEGAPULS 6X Two-wire Profibus PA Product: VEGAPULS C 21 Four-wire Modbus Product: VEGAPULS C 21 Two-wire 4_20 mA/HART Product: VEGAPULS C 22 Four-wire Modbus Product: VEGAPULS C 22 Two-wire 4_20 mA/HART Product: VEGAPULS C 23 Four-wire Modbus Product: VEGAPULS C 23 Two-wire 4_20 mA/HART

Summary

Vulnerable components expose sensitive information to unauthorized actors through an unsecured configuration interface. Vulnerable firmware releases contain an unsecured configuration interface that allows retrieval of sensitive information such as hashed credentials.

It was found that users with no or low rights can access information from devices that should not be available to them.

An attacker can use this information to impersonate authorized users.

Details

Impact
An unauthenticated attacker can obtain sensitive information, potentially enabling authenticated device modification.

Mitigation
Implement access controls for physical interfaces to prevent unauthorized access.

Remediation
Update to the fixed firmware versions listed in this advisory. Rotate any credentials used on affected devices as they may have been compromised. Contact VEGA Support if emergency code rotation is necessary based on your risk assessment.

Fixed Versions:
* Firmware 1.3.2 installed on VEGAPULS 6X Two-wire 4_20 mA/HART
* Firmware 1.4.1 installed on VEGAPULS 6X Two-wire 4_20 mA/HART
* Firmware 1.3.2 installed on VEGAPULS 6X Two-wire 4_20 mA/HART plus second current output 4_20 mA
* Firmware 1.4.1 installed on VEGAPULS 6X Two-wire 4_20 mA/HART plus second current output 4_20 mA
* Firmware 1.3.2 installed on VEGAPULS 6X Two-wire 4_20 mA/HART with overvoltage protection (Not for Ex Zone 0, 20; not for Div 1)
* Firmware 1.4.1 installed on VEGAPULS 6X Two-wire 4_20 mA/HART with overvoltage protection (Not for Ex Zone 0, 20; not for Div 1)
* Firmware 1.3.2 installed on VEGAPULS 6X Four-wire 4_20 mA/HART; 90_253 V AC; 50/60 Hz
* Firmware 1.4.1 installed on VEGAPULS 6X Four-wire 4_20 mA/HART; 90_253 V AC; 50/60 Hz
* Firmware 1.3.2 installed on VEGAPULS 6X Four-wire 4_20 mA/HART; 9.6_48 V DC; 20_42 V AC
* Firmware 1.4.1 installed on VEGAPULS 6X Four-wire 4_20 mA/HART; 9.6_48 V DC; 20_42 V AC
* Firmware 1.2.3 installed on VEGAPULS C 21 Two-wire 4_20 mA/HART
* Firmware 1.2.2 installed on VEGAPULS C 21 Four-wire Modbus
* Firmware 1.2.3 installed on VEGAPULS 21 Two-wire 4_20 mA/HART
* Firmware 1.2.3 installed on VEGAPULS 31 Two-wire 4_20 mA/HART
* Firmware 1.2.1 installed on VEGAPULS 42 Three-wire IO-Link, Transistor, 4_20 mA
* Firmware 1.2.3 installed on VEGAPULS C 22 Two-wire 4_20 mA/HART
* Firmware 1.2.3 installed on VEGAPULS C 23 Two-wire 4_20 mA/HART
* Firmware 1.2.2 installed on VEGAPULS C 22 Four-wire Modbus
* Firmware 1.2.2 installed on VEGAPULS C 23 Four-wire Modbus
* Firmware 1.1.1 installed on VEGAPULS 6X Two-wire EtherNet/IP, Modbus TCP, OPC UA (Ethernet-APL)
* Firmware 1.0.1 installed on VEGAPULS 6X Two-wire Profibus PA
* Firmware 1.3.2 installed on VEGAPULS 6X Four-wire Modbus
* Firmware 1.4.1 installed on VEGAPULS 6X Four-wire Modbus

Vulnerabilities 1

Revision history

  1. #1.0.3

    Fixed version range name and vendor name

  2. #1.0.2

    Added fixed versions to document notes remediation

  3. #1.0.1

    Updated Title

  4. #1.0.0

    Initial Release

References