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Phoenix Contact: Multiple vulnerabilities in PLCnext Control devices < 2021.0 LTS

VDE-2020-049
Last update
17.12.2020 10:00
Published at
17.12.2020 10:00
Vendor(s)
Phoenix Contact GmbH & Co. KG
External ID
VDE-2020-049
CSAF Document
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Summary

Multiple vulnerabilities have been identified in PLCnext Control devices. Please consult the aforementioned CVE-IDs.

Impact

See Impact for the listed CVE-IDs.

Affected Product(s)

Model no. Product name Affected versions
1151412 AXC F 1152 Firmware <2021.0 LTS
2404267 AXC F 2152 Firmware <2021.0 LTS
1046568 AXC F 2152 Starterkit Firmware <2021.0 LTS
1069208 AXC F 3152 Firmware <2021.0 LTS
1188165 PLCnext Technology Starterkit Firmware <2021.0 LTS
1051328 RFC 4072S Firmware <2021.0 LTS

Vulnerabilities

Expand / Collapse all

Published
22.09.2025 14:58
Severity
9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
Improper Privilege Management (CWE-269)
Summary

On Phoenix Contact PLCnext Control Devices versions before 2021.0 LTS an attacker can use this vulnerability i.e. to open a reverse shell with root privileges.

References
cve.org | nvd.nist.gov

Published
22.09.2025 14:58
Severity
9 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Weakness
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (CWE-79)
Summary

On Phoenix Contact PLCnext Control Devices versions before 2021.0 LTS an authenticated low privileged user could embed malicious Javascript code to gain admin rights when the admin user visits the vulnerable website (local privilege escalation).

References
cve.org | nvd.nist.gov

Published
22.09.2025 14:58
Severity
6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
Improper Input Validation (CWE-20)
Summary

On Phoenix Contact PLCnext Control Devices versions before 2021.0 LTS a specially crafted LLDP packet may lead to a high system load in the PROFINET stack. An attacker can cause failure of system services or a complete reboot.

References
cve.org | nvd.nist.gov

Published
22.09.2025 14:58
Severity
5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness
Exposure of Sensitive Information to an Unauthorized Actor (CWE-200)
Summary

On Phoenix Contact PLCnext Control Devices versions before 2021.0 LTS an attacker can use the knowledge gained by reading the insufficiently protected sensitive information to plan further attacks.

References
cve.org | nvd.nist.gov

Mitigation

Phoenix Contact 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:Measures to protect network-capable devices with Ethernet connection (PDF)

Remediation

Phoenix Contact recommends affected users to upgrade to the current Firmware 2021.0 LTS or higher which fixes these vulnerabilities.

Revision History

Version Date Summary
1 17.12.2020 10:00 Initial revision.