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1. EXECUTIVE SUMMARY
- CVSS v4 8.2
- ATTENTION: Exploitable remotely
- Vendor: Mitsubishi Electric
- Equipment: CC-Link IE TSN Remote I/O module, CC-Link IE TSN Analog-Digital Converter module, CC-Link IE TSN Digital-Analog Converter module, CC-Link IE TSN FPGA module, CC-Link IE TSN Remote Station Communication LSI CP620 with GbE-PHY
- Vulnerability: Improper Validation of Specified Quantity in Input
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to cause a denial-of-service condition on the affected products.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Mitsubishi Electric CC-Link IE TSN, a network controller, are affected:
- CC-Link IE TSN Remote I/O module NZ2GN2S1-32D/32T/32TE/32DT/32DTE: Versions 09 and prior
- CC-Link IE TSN Remote I/O module NZ2GN2B1-32D/32T/32TE/32DT/32DTE: Versions 09 and prior
- CC-Link IE TSN Remote I/O module NZ2GNCF1-32D/32T: Versions 09 and prior
- CC-Link IE TSN Remote I/O module NZ2GNCE3-32D/32DT: Versions 09 and prior
- CC-Link IE TSN Remote I/O module NZ2GN12A4-16D/16DE: Versions 09 and prior
- CC-Link IE TSN Remote I/O module NZ2GN12A2-16T/16TE: Versions 09 and prior
- CC-Link IE TSN Remote I/O module NZ2GN12A42-16DT/16DTE: Versions 09 and prior
- CC-Link IE TSN Remote I/O module NZ2GN2S1-16D/16T/16TE: Versions 09 and prior
- CC-Link IE TSN Remote I/O module NZ2GN2B1-16D/16T/16TE: Versions 09 and prior
- CC-Link IE TSN Analog-Digital Converter module NZ2GN2S-60AD4: Versions 07 and prior
- CC-Link IE TSN Analog-Digital Converter module NZ2GN2B-60AD4: Versions 07 and prior
- CC-Link IE TSN Digital-Analog Converter module NZ2GN2S-60DA4: Versions 07 and prior
- CC-Link IE TSN Digital-Analog Converter module NZ2GN2B-60DA4: Versions 07 and prior
- CC-Link IE TSN FPGA module NZ2GN2S-D41P01/D41D01/D41PD02: Version 01
- CC-Link IE TSN Remote Station Communication LSI CP620 with GbE-PHY NZ2GACP620-300/60: Versions 1.08J and prior
3.2 VULNERABILITY OVERVIEW
A remote attacker could cause a denial-of-service (DoS) condition in the products by sending specially crafted UDP packets. The threat arises when the affected product does not receive a valid UDP packet within 3 seconds after receiving a specially crafted UDP packet from a remote attacker, necessitating a system reset of the product for recovery.
CVE-2025-3511 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-2025-3511. A base score of 8.2 has been calculated; the CVSS vector string is (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: Critical Manufacturing
- COUNTRIES/AREAS DEPLOYED: Worldwide
- COMPANY HEADQUARTERS LOCATION: Japan
3.4 RESEARCHER
Mitsubishi Electric reported this vulnerability to CISA.
4. MITIGATIONS
Mitsubishi Electric recommends that users update to the following:
- CC-Link IE TSN Remote I/O module NZ2GN2S1-32D/32T/32TE/32DT/32DTE: Versions 10 or later
- CC-Link IE TSN Remote I/O module NZ2GN2B1-32D/32T/32TE/32DT/32DTE: Versions 10 or later
- CC-Link IE TSN Remote I/O module NZ2GNCF1-32D/32T: Versions 10 or later
- CC-Link IE TSN Remote I/O module NZ2GNCE3-32D/32DT: Versions 10 or later
- CC-Link IE TSN Remote I/O module NZ2GN12A4-16D/16DE: Versions 10 or later
- CC-Link IE TSN Remote I/O module NZ2GN12A2-16T/16TE: Versions 10 or later
- CC-Link IE TSN Remote I/O module NZ2GN12A42-16DT/16DTE: Versions 10 or later
- CC-Link IE TSN Remote I/O module NZ2GN2S1-16D/16T/16TE: Versions 10 or later
- CC-Link IE TSN Remote I/O module NZ2GN2B1-16D/16T/16TE: Versions 10 or later
- CC-Link IE TSN Analog-Digital Converter module NZ2GN2S-60AD4: Versions 08 or later
- CC-Link IE TSN Analog-Digital Converter module NZ2GN2B-60AD4: Versions 08 or later
- CC-Link IE TSN Digital-Analog Converter module NZ2GN2S-60DA4: Versions 08 or later
- CC-Link IE TSN Digital-Analog Converter module NZ2GN2B-60DA4: Versions 08 or later
- CC-Link IE TSN FPGA module NZ2GN2S-D41P01/D41D01/D41PD02: Versions 02 or later
- CC-Link IE TSN Remote Station Communication LSI CP620 with GbE-PHY NZ2GACP620-300/60: Versions 1.09K or later
Mitsubishi Electric recommends users take the following mitigation measures to minimize the risk of exploiting this vulnerability:
- Use a firewall, virtual private network (VPN), etc. to prevent unauthorized access when Internet access is required.
- Use within a LAN and block access from untrusted networks and hosts through firewalls.
- Restrict physical access to the affected products and the LAN to which they are connected.
- Install anti-virus software on your PC that can access the product.
For more information, see Mitsubishi Electric advisory 2025-001.
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:
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
- May 8, 2025 - Initial Republication Mitsubishi Electric Advisory 2025-001