Mitsubishi Electric CNC Series (Update A)

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1. EXECUTIVE SUMMARY

• CVSS v4 8.2
• ATTENTION: Exploitable remotely
• Vendor: Mitsubishi Electric
• Equipment: CNC Series
• Vulnerability: Improper Validation of Specified Quantity in Input

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an unauthenticated remote attacker to cause a denial-of-service condition on the affected device.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following Mitsubishi Electric products are affected:

• M800VW (BND-2051W000-** ): Versions B1 and prior
• M800VS (BND-2052W000-** ): Versions B1 and prior
• M80V (BND-2053W000-** ): Versions B1 and prior
• M80VW (BND-2054W000-** ): Versions B1 and prior
• M800W (BND-2005W000-** ): Versions FH and prior
• M800S (BND-2006W000-** ): Versions FH and prior
• M80 (BND-2007W000-** ): Versions FH and prior
• M80W (BND-2008W000-** ): Versions FH and prior
• E80 (BND-2009W000-** ): Versions FH and prior
• C80 (BND-2036W000-** ): All versions
• M750VW (BND-1015W002-** ): All versions
• M730VW/M720VW (BND-1015W000-** ): All versions
• M750VS (BND-1012W002-** ): All versions
• M730VS/M720VS (BND-1012W000-** ): All versions
• M70V (BND-1018W000-** ): All versions
• E70 (BND-1022W000-** ): All versions
• NC Trainer2 (BND-1802W000-** ): All versions
• NC Trainer2 plus (BND-1803W000-** ): All versions

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER VALIDATION OF SPECIFIED QUANTITY IN INPUT CWE-1284

A denial-of-service (DoS) vulnerability exists in Numerical Control Systems (CNC). A malicious unauthenticated remote attacker may cause a denial-of-service (DoS) condition in the affected product by sending specially crafted packets to TCP port 683

CVE-2024-7316 has been assigned to this vulnerability. A CVSS v3.1 base score of 5.9 has been calculated; the CVSS vector string is (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-2024-7316. 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).

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Energy
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: Japan

3.4 RESEARCHER

Mitsubishi Electric reported this vulnerability to CISA.

4. MITIGATIONS

Mitsubishi Electric recommends users take the following actions to minimize the risk of exploiting this vulnerability.

• M800VW (BND-2051W000-** ): Update to B2 or later
• M800VS (BND-2052W000-** ): Update to B2 or later
• M80V (BND-2053W000-** ): Update to B2 or later
• M80VW (BND-2054W000-** ): Update to B2 or later
• M800W (BND-2005W000-** ): Update to FJ or later
• M800S (BND-2006W000-** ): Update to FJ or later
• M80 (BND-2007W000-** ): Update to FJ or later
• M80W (BND-2008W000-** ): Update to FJ or later
• E80 (BND-2009W000-** ): Update to FJ or later

Additionally, Mitsubishi Electric recommends the following mitigations:

• Use a firewall, virtual private network (VPN), etc. to prevent unauthorized access when Internet access is required.
• Install anti-virus software on the PC that can access the product.
• Use within a LAN and block access from untrusted networks and hosts through firewalls.
• Restrict physical access to the affected product and the LAN to which the product is connected.
• Use IP filter function to block access from untrusted hosts.
• IP filter function is available for M800V/M80V Series and M800/M80/E80 Series.
• For details about the IP filter function, please refer to the following manual for each product: M800V/M80V Series Instruction Manual "16. Appendix 3 IP Address Filter Setting Function" and M800/M80/E80 Series Instruction Manual "15. Appendix 2 IP Address Filter Setting Function."

CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability, 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.

For additional information see Mitsubishi Electric advisory

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 this vulnerability has been reported to CISA at this time. This vulnerability has a high attack complexity.

5. UPDATE HISTORY

• October 17, 2024: Initial Publication
• February 20, 2025: Update A - Updates to product list, mitigations, added CVSS v4 score.

• Mitsubishi Electric