← Vulnerability feed

Vulnerability record · CVE-2020-12523 · published 17 December 2020

CVE-2020-12523: Phoenixcontact tc mguard rs4000 4g vzw vpn firmware vulnerability

Phoenixcontact · Tc Mguard Rs4000 4g Vzw Vpn Firmware

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

9.1 CVSS 3.1 Critical EPSS 0.90% · top 41.1% CWE-909 · CWE-909
9.1CVSS 3.1 base score, v2 6.4
0.90%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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

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

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://cert.vde.com/en-us/advisories/vde-2020-046 Third Party Advisory
https://cert.vde.com/en-us/advisories/vde-2020-046 Third Party Advisory

Track CVE-2020-12523 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2024-7699Phoenixcontact tc mguard rs4000 4g vzw vpn firmware os command injection vulnerabilityAn low privileged remote attacker can execute OS commands with root privileges due to improper neutralization of special elements in user data.EPSS 0.76%8.8CVE-2024-43386Phoenixcontact tc mguard rs4000 4g vzw vpn firmware os command injection vulnerabilityA low privileged remote attacker can trigger the execution of arbitrary OS commands as root due to improper neutralization of special elements in the…EPSS 0.74%8.8CVE-2024-43387Phoenixcontact tc mguard rs4000 4g vzw vpn firmware os command injection vulnerabilityA low privileged remote attacker can read and write files as root due to improper neutralization of special elements in the variable EMAIL_RELAY_PASS…EPSS 0.57%8.8CVE-2024-43385Phoenixcontact tc mguard rs4000 4g vzw vpn firmware os command injection vulnerabilityA low privileged remote attacker can trigger the execution of arbitrary OS commands as root due to improper neutralization of special elements in the…EPSS 0.74%8.8CVE-2024-43388Phoenixcontact tc mguard rs4000 4g vzw vpn firmware code injection vulnerabilityA low privileged remote attacker with write permissions can reconfigure the SNMP service due to improper input validation.EPSS 0.57%8.1CVE-2024-43393Phoenixcontact tc mguard rs4000 4g vzw vpn firmware code injection vulnerabilityA low privileged remote attacker can perform configuration changes of the firewall services, including packet filter, packet forwarding, network acce…EPSS 0.52%8.1CVE-2024-43392Phoenixcontact tc mguard rs4000 4g vzw vpn firmware code injection vulnerabilityA low privileged remote attacker can perform configuration changes of the firewall services, including packet filter, packet forwarding, network acce…EPSS 0.52%8.1CVE-2024-43391Phoenixcontact tc mguard rs4000 4g vzw vpn firmware code injection vulnerabilityA low privileged remote attacker can perform configuration changes of the firewall services, including packet filter, packet forwarding, network acce…EPSS 0.52%

Source: NIST National Vulnerability Database (record CVE-2020-12523), CISA KEV, FIRST EPSS (scores of 2026-10-17). This page is refreshed as NVD updates the record.