Mitsubishi Electric MELSOFT Update Manager

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1. EXECUTIVE SUMMARY CVSS v3 8.1 ATTENTION: Exploitable remotely/low attack complexity Vendor: Mitsubishi Electric Equipment: MELSOFT Update Manager Vulnerabilities: Integer Underflow (Wrap or Wraparound), Protection Mechanism Failure
2. RISK EVALUATION Successful exploitation of these vulnerabilities could allow an attacker to execute arbitrary code, disclose information, alter information, or cause a denial-of-service (DoS) condition.
3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of Mitsubishi Electric MELSOFT Update Manager are affected: MELSOFT Update Manager SW1DND-UDM-M: Versions 1.000A to 1.012N 3.2 VULNERABILITY OVERVIEW 3.2.1 INTEGER UNDERFLOW (WRAP OR WRAPAROUND) CWE-191 Mitsubishi Electric MELSOFT Update Manager is vulnerable to an Integer Underflow vulnerability in 7-zip, included in MELSOFT Update Manager, that could allow a remote attacker to execute arbitrary code by decompressing a specially crafted compressed file. As a result, the attacker may disclose, tamper with information, or cause a denial-of-service (DoS) condition on the product. CVE-2024-11477 has been assigned to this vulnerability. A CVSS v3.1 base score of 8.1 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H). 3.2.2 PROTECTION MECHANISM FAILURE CWE-693 Mitsubishi Electric MELSOFT Update Manager is vulnerable to an Protection Mechanism Failure vulnerability in 7-zip, included in MELSOFT Update Manager, that could allow an attacker to execute arbitrary code by decompressing a specially crafted compressed file. As a result, the attacker may disclose, tamper with information, or cause a denial-of-service (DoS) condition on the product. CVE-2025-0411 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). 3.3 BACKGROUND CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing COUNTRIES/AREAS DEPLOYED: Worldwide COMPANY HEADQUARTERS LOCATION: Japan 3.4 RESEARCHER Mitsubishi Electric reported these vulnerabilities to CISA.
4. MITIGATIONS Mitsubishi Electric recommends users take the following actions to minimize the risk of exploiting these vulnerabilities. For users in Japan: Download version 1.013P or later from the download site below and follow the update procedure below (Note). Additionally, please verify the authenticity of the following download site in advance. Download Site (in Japanese) Update Procedure: Extract the downloaded file (in zip format). Run “setup.exe” in the extracted folder to install. Note: If you are using MELSOFT Update Manager version 1.012N and prior, please do not connect to the internet until the above update is complete. There is a risk that these vulnerabilities could be exploited. For users outside Japan: For information about how to install the fixed version, please contact your local Mitsubishi Electric representative. For users who cannot immediately update the product, Mitsubishi Electric recommends the following mitigation measures to minimize the risk of exploiting these vulnerabilities. Use the PC with the affected product within the LAN and block remote logins from untrusted networks, hosts, and users. When connecting the PC with the affected product to the internet, use a firewall, virtual private network (VPN), etc. to prevent unauthorized access and allow only trusted users to remote login. Restrict physical access to the PC with the affected product and the network to which the PC is connected to, to prevent unauthorized physical access . Do not click on web links in emails from untrusted sources. Also, do not open attachments in untrusted emails. Install antivirus software on the PC with the affected product. For more information, see Mitsubishi Electric 2025-006. 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/ics. 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/ics 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. These vulnerabilities have a high attack complexity.
5. UPDATE HISTORY July 3, 2025: Initial Republication of Mitsubishi Electric 2025-006