METZ CONNECT EWIO2

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1. EXECUTIVE SUMMARY CVSS v4 9.3 ATTENTION: Exploitable remotely/low attack complexity Vendor: METZ CONNECT Equipment: EWIO2 Vulnerabilities: Authentication Bypass by Primary Weakness, Improper Control of Filename for Include/Require Statement in PHP Program (‘PHP Remote File Inclusion’), Unrestricted Upload of File with Dangerous Type, Path Traversal: '…/…//’, Improper Access Control
2. RISK EVALUATION Successful exploitation of these vulnerabilities could allow an attacker to bypass authentication and control the device remotely or perform remote code execution.
3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS METZ CONNECT reports that the following products are affected: METZ CONNECT Firmware (<2.2.0) installed on METZ CONNECT Hardware EWIO2-M: All versions METZ CONNECT Firmware (<2.2.0) installed on METZ CONNECT Hardware EWIO2-M-BM: All versions METZ CONNECT Firmware (<2.2.0) installed on METZ CONNECT Hardware EWIO2-BM: All versions 3.2 Vulnerability Overview 3.2.1 AUTHENTICATION BYPASS BY PRIMARY WEAKNESS CWE-305 The commissioning wizard on the affected devices does not validate if the device is already initialized. An unauthenticated remote attacker can construct POST requests to set root credentials. CVE-2025-41733 has been assigned to this vulnerability. A CVSS v3.1 base score of 9.8 has been calculated; the CVSS vector string is (CVSS:3.1/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-2025-41733. 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). 3.2.2 IMPROPER CONTROL OF FILENAME FOR INCLUDE/REQUIRE STATEMENT IN PHP PROGRAM (‘PHP REMOTE FILE INCLUSION’) CWE-98 An unauthenticated remote attacker can execute arbitrary PHP files and gain full access of the affected devices. CVE-2025-41734 has been assigned to this vulnerability. A CVSS v3.1 base score of 9.8 has been calculated; the CVSS vector string is (CVSS:3.1/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-2025-41734. 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). 3.2.3 UNRESTRICTED UPLOAD OF FILE WITH DANGEROUS TYPE CWE-434 A low privileged remote attacker can upload any file to an arbitrary location due to missing file check resulting in remote code execution. CVE-2025-41735 has been assigned to this vulnerability. A CVSS v3.1 base score of 8.8 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). A CVSS v4 score has also been calculated for CVE-2025-41735. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N). 3.2.4 PATH TRAVERSAL: ‘…/…//’ CWE-35 A low privileged remote attacker can upload a new or overwrite an existing python script by using a path traversal of the target filename in PHP resulting in a remote code execution. CVE-2025-41736 has been assigned to this vulnerability. A CVSS v3.1 base score of 8.8 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). A CVSS v4 score has also been calculated for CVE-2025-41736. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N). 3.2.5 IMPROPER ACCESS CONTROL CWE-284 Due to webserver misconfiguration an unauthenticated remote attacker is able to read the source of PHP modules. CVE-2025-41737 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.1/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-2025-41737. 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). 3.3 BACKGROUND CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing COUNTRIES/AREAS DEPLOYED: Worldwide COMPANY HEADQUARTERS LOCATION: Germany 3.4 RESEARCHER Noam Moshe and Tomer Goldschmidt of Claroty Team82 reported these vulnerabilities to CISA.
4. MITIGATIONS METZ CONNECT has identified the following specific workarounds and mitigations users can apply to reduce risk: (Product Group: METZ CONNECT Firmware (<2.2.0) installed on METZ CONNECT Hardware EWIO2-M(All versions), METZ CONNECT Firmware (<2.2.0) installed on METZ CONNECT Hardware EWIO2-M-BM(All versions), METZ CONNECT Firmware (<2.2.0) installed on METZ CONNECT Hardware EWIO2-BM(All versions)): METZ CONNECT has released a new SW-Version 2.2.0. Install version 2.2.0 or later to remediate this vulnerability. Schedule the update at your next maintenance window. No workaround offers equivalent protection. The following product versions have been fixed: Firmware 2.2.0 installed on Energy-Controlling EWIO2-M is a fixed version for CVE-2025-41733 Firmware 2.2.0 installed on Energy-Controlling EWIO2-M-BM is a fixed version for CVE-2025-41733 Firmware 2.2.0 installed on Ethernet-IO EWIO2-BM is a fixed version for CVE-2025-41733 Firmware 2.2.0 installed on Energy-Controlling EWIO2-M is a fixed version for CVE-2025-41734 Firmware 2.2.0 installed on Energy-Controlling EWIO2-M-BM is a fixed version for CVE-2025-41734 Firmware 2.2.0 installed on Ethernet-IO EWIO2-BM is a fixed version for CVE-2025-41734 Firmware 2.2.0 installed on Energy-Controlling EWIO2-M is a fixed version for CVE-2025-41735 Firmware 2.2.0 installed on Energy-Controlling EWIO2-M-BM is a fixed version for CVE-2025-41735 Firmware 2.2.0 installed on Ethernet-IO EWIO2-BM is a fixed version for CVE-2025-41735 Firmware 2.2.0 installed on Energy-Controlling EWIO2-M is a fixed version for CVE-2025-41736 Firmware 2.2.0 installed on Energy-Controlling EWIO2-M-BM is a fixed version for CVE-2025-41736 Firmware 2.2.0 installed on Ethernet-IO EWIO2-BM is a fixed version for CVE-2025-41736 Firmware 2.2.0 installed on Energy-Controlling EWIO2-M is a fixed version for CVE-2025-41737 Firmware 2.2.0 installed on Energy-Controlling EWIO2-M-BM is a fixed version for CVE-2025-41737 Firmware 2.2.0 installed on Ethernet-IO EWIO2-BM is a fixed version for CVE-2025-41737 For more information see the associated METZ CONNECT GmbH security advisory VDE-2025-097 VDE-2025-097: Metz: Config API – Authentication bypass leads to admin takeover in EWIO2 series - HTML, VDE-2025-097: Metz: Config API – Authentication bypass leads to admin takeover in EWIO2 series - CSAF. CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities, such as: Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolating them from business networks. When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs). Recognize VPNs may have vulnerabilities, should be updated to the most recent version available, and are only as secure as the connected devices. 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 November 18, 2025: Initial Publication