Back to overview

PHOENIX CONTACT: mGuard <8.8.3 products missing initialization of resource

VDE-2020-046
Last update
05/14/2025 14:28
Published at
12/17/2020 10:01
Vendor(s)
Phoenix Contact GmbH & Co. KG
External ID
VDE-2020-046
CSAF Document
Download

Summary

For mGuard devices with integrated switch on the LAN side, single switch ports can be disabled by device configuration. After a reboot these ports get functional independent from their configuration setting: Missing Initialization of Resource (CWE-909).

Impact

After a reboot, affected mGuard devices may unexpectedly receive or send data on disabled switch ports. This includes the unexpected provision of administrative interfaces. Attackers may try to access confidential data or compromise the availability of mGuard services by flooding or resource exhaustion.

Affected Product(s)

Model no. Product name Affected versions
2701876 FL MGUARD RS4004 TX/DTX <8.8.3
2701877 FL MGUARD RS4004 TX/DTX VPN <8.8.3
2903440 TC MGUARD RS4000 3G VPN <8.8.3
1010463 TC MGUARD RS4000 4G ATT VPN <8.8.3
2903586 TC MGUARD RS4000 4G VPN <8.8.3
1010461 TC MGUARD RS4000 4G VZW VPN <8.8.3
mGuard rs4000 4TX/3G/TX VPN <8.8.3
mGuard rs4000 4TX/TX <8.8.3
mGuard rs4000 4TX/TX VPN <8.8.3

Vulnerabilities

Expand / Collapse all

Published
09/22/2025 14:57
Severity
9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness
Missing Initialization of Resource (CWE-909)
Summary

On Phoenix Contact mGuard Devices versions before 8.8.3 LAN ports get functional after reboot even if they are disabled in the device configuration. For mGuard devices with integrated switch on the LAN side, single switch ports can be disabled by device configuration. After a reboot these ports get functional independent from their configuration setting: Missing Initialization of Resource

References
cve.org | nvd.nist.gov

Mitigation

Instead of deactivating by configuration, network cables should be detached from affected switch
ports.

Remediation

Mitigation Instead of deactivating by configuration, network cables should be detached from affected switchports. Solution PHOENIX CONTACT recommends all mGuard users to upgrade to the firmware version 8.8.3.

Revision History

Version Date Summary
1 12/17/2020 10:01 Initial revision.
2 05/14/2025 14:28 Fix: removed ia, added distribution