Schneider Electric Modicon Controllers

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1. EXECUTIVE SUMMARY

• CVSS v3 10.0
• ATTENTION: Exploitable remotely/low attack complexity
• Vendor: Schneider Electric
• Equipment: Modicon M580, Modicon M340, Modicon Premium, and Modicon Quantum
• Vulnerabilities: Trust Boundary Violation, Uncaught Exception, Exposure of Sensitive Information to an Unauthorized Actor, Authentication Bypass by Spoofing, Improper Access Control, Reliance on Untrusted Inputs in a Security Decision, Out-of-bounds Read

2. RISK EVALUATION

Successful exploitation of these vulnerabilities may risk execution of unsolicited command on the PLC, which could result in a loss of availability of the controller.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Schneider Electric reports that the following products are affected:

• Modicon M580: All versions prior to 2.90 (CVE-2018-7846, CVE-2018-7849, CVE-2018-7848, CVE-2018-7842, CVE-2018-7847, CVE-2018-7850, CVE-2018-7853, CVE-2018-7854, CVE-2019-6808, CVE-2019-6828, CVE-2019-6829, CVE-2019-6809)
• Modicon Momentum CPU (part numbers 171CBU*): All versions (CVE-2018-7857)
• Modicon Quantum: All versions prior to 3.60 (CVE-2018-7843, CVE-2018-7845, CVE-2018-7852, CVE-2018-7856, CVE-2019-6807)
• Modicon Quantum: All versions (CVE-2018-7846, CVE-2018-7849, CVE-2018-7848, CVE-2018-7842, CVE-2018-7847, CVE-2018-7850, CVE-2018-7855, CVE-2018-7857, CVE-2019-6806, CVE-2019-6808, CVE-2018-7844, CVE-2019-6828, CVE-2019-6809)
• Modicon Premium: All versions (CVE-2018-7846, CVE-2018-7849, CVE-2018-7848, CVE-2018-7842, CVE-2018-7847, CVE-2018-7850, CVE-2018-7855, CVE-2018-7857, CVE-2019-6806, CVE-2019-6808, CVE-2018-7844, CVE-2019-6828, CVE-2019-6809)
• Modicon Premium: All versions prior to 3.60 (CVE-2018-7852, CVE-2019-6807)
• PLC Simulator for EcoStruxure Control Expert: All versions prior to 15.1 (CVE-2018-7857)
• Modicon Premium: All versions prior to 3.20 (CVE-2018-7843, CVE-2018-7845, CVE-2018-7852, CVE-2018-7856, CVE-2019-6807)
• Modicon Momentum Unity M1E Processor (part numbers 171CBU*): All versions prior to SV2.6 (CVE-2018-7857, CVE-2019-6807)
• Modicon M580: All versions prior to sv4.20 (CVE-2018-7855)
• Modicon M340: All versions prior to SV3.60 (CVE-2018-7855)
• Modicon MC80: All versions (CVE-2018-7855)
• Modicon Momentum M1E: All versions (CVE-2018-7855)
• Modicon M580: All versions prior to 2.80 (CVE-2018-7843, CVE-2018-7845, CVE-2018-7852, CVE-2018-7856, CVE-2019-6807, CVE-2019-6830)
• Modicon Quantum Safety: All versions (CVE-2018-7846, CVE-2018-7849, CVE-2018-7848, CVE-2018-7842, CVE-2018-7847, CVE-2018-7850, CVE-2018-7852, CVE-2018-7855, CVE-2018-7857, CVE-2019-6806, CVE-2019-6808, CVE-2018-7844)
• Modicon M340: All versions prior to 3.10 (CVE-2018-7846, CVE-2018-7849, CVE-2018-7843, CVE-2018-7848, CVE-2018-7842, CVE-2018-7847, CVE-2018-7850, CVE-2018-7845, CVE-2018-7852, CVE-2018-7854, CVE-2018-7856, CVE-2019-6807, CVE-2019-6808, CVE-2019-6828, CVE-2019-6829, CVE-2019-6809)
• Modicon M340: All versions (CVE-2018-7857, CVE-2019-6806, CVE-2018-7844)
• Modicon M580: All versions (CVE-2018-7857, CVE-2019-6806, CVE-2018-7844)
• Modicon MC80 BMKC80*: Versions prior to 1.80 (CVE-2018-7857)

3.2 VULNERABILITY OVERVIEW

3.2.1 TRUST BOUNDARY VIOLATION CWE-501

A trust boundary violation vulnerability on connection to the controller exists, which could cause unauthorized access by conducting a brute force attack on Modbus protocol to the controller.

CVE-2018-7846 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

A CVSS v4 score has also been calculated for  CVE-2018-7846. A base score of 6.9 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N).

3.2.2 UNCAUGHT EXCEPTION CWE-248

An uncaught exception vulnerability exists, which could cause a possible denial-of-service due to improper data integrity check when sending files to the controller over Modbus.

CVE-2018-7849 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for  CVE-2018-7849. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.2.3 UNCAUGHT EXCEPTION CWE-248

An uncaught exception vulnerability exists, which could cause denial-of-service when reading memory blocks with an invalid data size or with an invalid data offset in the controller over Modbus.

CVE-2018-7843 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for  CVE-2018-7843. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.2.4 EXPOSURE OF SENSITIVE INFORMATION TO AN UNAUTHORIZED ACTOR CWE-200

An information exposure vulnerability exists, which could cause the disclosure of SNMP information when reading files from the controller over Modbus.

CVE-2018-7848 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).

A CVSS v4 score has also been calculated for  CVE-2018-7848. A base score of 8.2 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N).

3.2.5 AUTHENTICATION BYPASS BY SPOOFING CWE-290

An authentication bypass by spoofing vulnerability exists, which could cause an elevation of privilege by conducting a brute force attack on Modbus parameters sent to the controller.

CVE-2018-7842 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

A CVSS v4 score has also been calculated for  CVE-2018-7842. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N).

3.2.6 IMPROPER ACCESS CONTROL CWE-284

An improper access control vulnerability exists, which could cause denial-of-service or potential code execution by overwriting configuration settings of the controller over Modbus.

CVE-2018-7847 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for  CVE-2018-7847. A base score of 9.3 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).

3.2.7 RELIANCE ON UNTRUSTED INPUTS IN A SECURITY DECISION CWE-807

A reliance on untrusted inputs in a security decision vulnerability exists, which could cause invalid information displayed in Unity Pro software.

CVE-2018-7850 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for  CVE-2018-7850. A base score of 9.3 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).

3.2.8 OUT-OF-BOUNDS READ CWE-125

An out-of-bounds read vulnerability exists, which could cause the disclosure of unexpected data from the controller when reading specific memory blocks in the controller over Modbus

CVE-2018-7845 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

A CVSS v4 score has also been calculated for  CVE-2018-7845. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N).

3.2.9 UNCAUGHT EXCEPTION CWE-248

An uncaught exception vulnerability exists, which could cause denial-of-service when an invalid private command parameter is sent to the controller over Modbus.

CVE-2018-7852 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for  CVE-2018-7852. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.2.10 UNCAUGHT EXCEPTION CWE-248

An uncaught exception vulnerability exists, which could cause denial-of-service when reading invalid physical memory blocks in the controller over Modbus.

CVE-2018-7853 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for  CVE-2018-7853. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.2.11 UNCAUGHT EXCEPTION CWE-248

An uncaught exception vulnerability exists, which could cause a denial-of-service when sending invalid debug parameters to the controller over Modbus.

CVE-2018-7854 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

A CVSS v4 score has also been calculated for  CVE-2018-7854. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.2.12 UNCAUGHT EXCEPTION CWE-248

An uncaught exception vulnerability exists, which could cause a denial-of-service when sending invalid breakpoint parameters to the controller over Modbus.

CVE-2018-7855 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

A CVSS v4 score has also been calculated for  CVE-2018-7855. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.2.13 UNCAUGHT EXCEPTION CWE-248

An uncaught exception vulnerability exists, which could cause a possible denial-of-service when writing invalid memory blocks to the controller over Modbus

CVE-2018-7856 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for  CVE-2018-7856. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.2.14 UNCAUGHT EXCEPTION CWE-248

An uncaught exception vulnerability exists, which could cause a possible denial-of-service when writing out-of-bounds variables to the controller over Modbus.

CVE-2018-7857 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for  CVE-2018-7857. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.2.15 UNCAUGHT EXCEPTION CWE-248

An information exposure vulnerability exists, which could cause the disclosure of SNMP information when reading variables in the controller using Modbus.

CVE-2019-6806 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

A CVSS v4 score has also been calculated for  CVE-2019-6806. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N).

3.2.16 UNCAUGHT EXCEPTION CWE-248

An uncaught exception vulnerability could cause a possible denial-of-service when writing sensitive application variables to the controller over Modbus.

CVE-2019-6807 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

A CVSS v4 score has also been calculated for  CVE-2019-6807. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.2.17 UNCAUGHT EXCEPTION CWE-248

An uncaught exception vulnerability exists, which could cause a remote code execution by overwriting configuration settings of the controller over Modbus

CVE-2019-6808 has been assigned to this vulnerability. A CVSS v3 base score of 10.0 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for  CVE-2019-6808. A base score of 10.0 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H).

3.2.18 EXPOSURE OF SENSITIVE INFORMATION TO AN UNAUTHORIZED ACTOR CWE-200

An exposure of sensitive information to an unauthorized actor vulnerability could cause a remote code execution by overwriting configuration settings of the controller over Modbus

CVE-2018-7844 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

A CVSS v4 score has also been calculated for  CVE-2018-7844. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N).

3.2.19 UNCAUGHT EXCEPTION CWE-248

An uncaught exception vulnerability could cause a possible denial-of-service when sending an appropriately timed HTTP request to the controller.

CVE-2019-6830 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for  CVE-2019-6830. A base score of 8.2 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.2.20 UNCAUGHT EXCEPTION CWE-248

An uncaught exception vulnerability could cause a possible denial-of-service when reading specific coils and registers in the controller over Modbus.

CVE-2019-6828 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for  CVE-2019-6828. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.2.21 UNCAUGHT EXCEPTION CWE-248

An uncaught exception vulnerability could cause a possible denial-of-service when writing to specific memory addresses in the controller over Modbus.

CVE-2019-6829 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for  CVE-2019-6829. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.2.22 UNCAUGHT EXCEPTION CWE-248

An uncaught exception vulnerability exists cause a possible denial-of-service when reading invalid data from the controller.

CVE-2019-6809 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for  CVE-2019-6809. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Critical Manufacturing, Energy
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: France

3.4 RESEARCHER

These vulnerabilities were reported to Schneider Electric by the following researchers:
Jared Rittle of Cisco Talos, Pavel Nesterov, Artem Zinenko of Kaspersky, Gao Jian of ns focus, and Dong Yang of Dingxiang Dongjian Security Lab.

4. MITIGATIONS

Schneider Electric has identified the following specific mitigations users can apply to reduce risk. Please see SEVD-2019-134-11 for detailed update steps.

Modicon M580:

• A fix is available for (CVE-2018-7846, CVE-2018-7849, CVE-2018-7848, CVE-2018-7842, CVE-2018-7845, CVE-2018-7847, CVE-2018-7850, CVE-2018-7853, CVE-2018-7854, CVE-2018-7856, CVE-2018-7857, CVE-2019-6808, CVE-2019-6828, CVE-2019-6829, CVE-2019-6830, CVE-2019-6809) on Modicon M580 firmware V3.10.
• A fix is available for (CVE-2018-7843, CVE-2018-7852, CVE-2019-6807) on Modicon M580 firmware V2.80.

Modicon M340:

• A fix is available for (CVE-2018-7846, CVE-2018-7849, CVE-2018-7843, CVE-2018-7848, CVE-2018-7842, CVE-2018-7847, CVE-2018-7850, CVE-2018-7845, CVE-2018-7852, CVE-2018-7854, CVE-2018-7856, CVE-2019-6807, CVE-2019-6808, CVE-2019-6828, CVE-2019-6829, CVE-2019-6809) on Modicon M340 firmware V3.20.

Modicon MC80:

• A fix is available for (CVE-2018-7857) on Modicon MC80 (part numbers BMKC80*).

Modicon Premium Modicon Momentum Unity M1E Processor:

• A fix is available for (CVE-2019-6807, CVE-2018-7857) on (part numbers 171CBU*) <SV2.6.

Modicon Quantum:

• A fix is available for (CVE-2018-7845, CVE-2018-7856) on Modicon Quantum V3.60.
• There is no fix available for (CVE-2018-7842, CVE-2018-7843, CVE-2018-7844, CVE-2018-7846, CVE-2018-7847, CVE-2018-7848, CVE-2018-7849, CVE-2018-7850, CVE-2018-7852, CVE-2018-7855, CVE-2018-7857, CVE-2019-6806, CVE-2019-6807, CVE-2019-6808, CVE-2019-6809, CVE-2019-6828). Schneider Electric's Modicon Quantum and Quantum Safety controllers have reached their end of life and are no longer commercially available. They have been replaced by the Modicon M580 or M580 Safety ePAC controller, the most current product offer. Users should strongly consider migrating to the Modicon M580 ePAC. Please contact a local Schneider Electric technical support for more information.

Modicon Premium:

• A fix is available for (CVE-2018-7845, CVE-2018-7856) on Modicon Premium V3.20, please contact Schneider Electric customer support to get the V3.20 firmware.
• There is no fix available for (CVE-2018-7842, CVE-2018-7843, CVE-2018-7844, CVE-2018-7847, CVE-2018-7848, CVE-2018-7849, CVE-2018-7850, CVE-2018-7852, CVE-2018-7855, CVE-2018-7857, CVE-2019-6806, CVE-2019-6807, CVE-2019-6808, CVE-2019-6809, CVE-2019-6828). Schneider Electric's Modicon Premium controllers have reached their end of life and are no longer commercially available. They have been replaced by the Modicon M580 ePAC controller, the most current product offer. Users should strongly consider migrating to the Modicon M580 ePAC. Please contact a local Schneider Electric technical support for more information.

PLC Simulator for EcoStruxure Control Expert:

• A fix is available for (CVE-2018-7857) on PLC Simulator.

Schneider Electric recommends the following to help mitigate weaknesses in the management of Modbus protocol:

• Set up an application password in the project properties.
• Set up network segmentation and implement a firewall to block all unauthorized access to Port 502/TCP.
• Configure the access control list following the recommendations of user manuals.
• Set up secure communication according to the guidelines for the product.
• Consider use of an external firewall device.
• Please see SEVD-2019-134-11 for detailed mitigation information.

For more information see the associated Schneider Electric security advisory Modicon Controllers - SEVD-2019-134-11 PDF Version, Modicon Controllers - SEVD-2019-134-11 CSAF Version.

Schneider Electric strongly recommends the following industry cybersecurity best practices:

• Locate control and safety system networks and remote devices behind firewalls and isolate them from the business network.
• Install physical controls so no unauthorized personnel can access your industrial control and safety systems, components, peripheral equipment, and networks.
• Place all controllers in locked cabinets and never leave them in the "Program" mode.
• Never connect programming software to any network other than the network for the devices that it is intended.
• Scan all methods of mobile data exchange with the isolated network such as CDs, USB drives, etc. before use in the terminals or any node connected to these networks.
• Never allow laptops that have connected to any other network besides the intended network to connect to the safety or control networks without proper sanitation.
• Minimize network exposure for all control system devices and systems, and ensure that they are not accessible from the Internet.
• When remote access is required, use secure methods, such as virtual private networks (VPNs). Recognize that VPNs may have vulnerabilities and should be updated to the most current version available. Also, understand that VPNs are only as secure as the connected devices.

CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.

CISA also recommends users take the following measures to protect themselves from social engineering attacks:

• Do not click web links or open attachments in unsolicited email messages.
• Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
• Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.

No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.

5. UPDATE HISTORY

• April 24, 2025: Initial Publication

• Schneider Electric