Vulnerability Monitor

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CVE-2020-12523

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

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 5.4, indicating it can be exploited remotely over the network with relatively low complexity though user interaction is required and does not require pre-existing privileges . The vulnerability impacts limited data confidentiality, and limited availability for affected systems. Impacting 18 products from phoenixcontact, from phoenixcontact, from phoenixcontact and 15 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2020, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2020-12-17T23:15:13.263

Last Modified

2026-06-17T02:51:58.110

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 5.4 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:N/A:P

  • Access Vector: NETWORK
  • Access Complexity: LOW
  • Authentication: NONE
  • Confidentiality Impact: PARTIAL
  • Integrity Impact: NONE
  • Availability Impact: PARTIAL
Exploitability Score

10.0

Impact Score

4.9

Weaknesses
  • Type: Secondary
    CWE-909
  • Type: Primary
    CWE-909
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Operating System phoenixcontact tc_mguard_rs4000_4g_vzw_vpn_firmware < 8.8.3 Yes
Hardware phoenixcontact tc_mguard_rs4000_4g_vzw_vpn - No
Operating System phoenixcontact tc_mguard_rs4000_4g_att_vpn_firmware < 8.8.3 Yes
Hardware phoenixcontact tc_mguard_rs4000_4g_att_vpn - No
Operating System phoenixcontact fl_mguard_rs4004_tx\/dtx_firmware < 8.8.3 Yes
Hardware phoenixcontact fl_mguard_rs4004_tx\/dtx - No
Operating System phoenixcontact fl_mguard_rs4004_tx\/dtx_vpn_firmware < 8.8.3 Yes
Hardware phoenixcontact fl_mguard_rs4004_tx\/dtx_vpn - No
Operating System phoenixcontact tc_mguard_rs4000_3g_vpn_firmware - Yes
Hardware phoenixcontact tc_mguard_rs4000_3g_vpn - No
Operating System phoenixcontact tc_mguard_rs4000_4g_vpn_firmware < 8.8.3 Yes
Hardware phoenixcontact tc_mguard_rs4000_4g_vpn - No
Operating System phoenixcontact innominate_mguard_rs4000_4tx\/tx_firmware < 8.8.3 Yes
Hardware phoenixcontact innominate_mguard_rs4000_4tx\/tx - No
Operating System phoenixcontact innominate_mguard_rs4000_4tx\/tx_vpn_firmware < 8.8.3 Yes
Hardware phoenixcontact innominate_mguard_rs4000_4tx\/tx_vpn - No
Operating System phoenixcontact innominate_mguard_rs4000_4tx\/3g\/tx_vpn_firmware < 8.8.3 Yes
Hardware phoenixcontact innominate_mguard_rs4000_4tx\/3g\/tx_vpn - No
References

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For phoenixcontact's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.