Mitsubishi Electric MELSEC iQ-F Series

View CSAF Summary Successful exploitation of this vulnerability could allow a remote attacker to cause a denial-of-service (DoS) condition in the affected product by rapidly establishing a large number of TCP connections to it, resulting in an inconsistency in the product's internal connection management process and triggering improper memory access. The following versions of Mitsubishi Electric MELSEC iQ-F Series are affected: MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP <=1.000 (CVE-2026-8805) CVSS Vendor Equipment Vulnerabilities v3 7.5 Mitsubishi Electric Mitsubishi Electric MELSEC iQ-F Series Integer Overflow or Wraparound Background Critical Infrastructure Sectors: Critical Manufacturing Countries/Areas Deployed: Worldwide Company Headquarters Location: Japan Vulnerabilities Expand All + CVE-2026-8805 An integer overflow or wraparound vulnerability exists in the EtherNet/IP function of MELSEC iQ-F Series EtherNet/IP module. This vulnerability could allow a remote attacker to cause a denial-of-service condition in the affected product by rapidly establishing a large number of TCP connections to it, resulting in an inconsistency in the product's internal connection management process and triggering improper memory access. View CVE Details Affected Products Mitsubishi Electric MELSEC iQ-F Series Vendor: Mitsubishi Electric Product Version: Mitsubishi Electric MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP: <=1.000 Product Status: known_affected Remediations Vendor fix Mitsubishi Electric is releasing fixed version 1.001 or later for MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP. Download the update file for the fixed version from the link "https://www.mitsubishielectric.com/fa/download/index.html" and install it. For more information on the fixed version, refer to the Mitsubishi Electric security advisory at "https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2026-002_en.pdf". https://www.mitsubishielectric.com/fa/download/index.html Mitigation For users who cannot immediately update the product, Mitsubishi Electric recommends using a firewall, virtual private network (VPN), etc. to prevent unauthorized access when internet access is required, to minimize the risk of exploiting this vulnerability. Mitigation For users who cannot immediately update the product, Mitsubishi Electric recommends using the affected product within a LAN and blocking access from untrusted networks and hosts through firewalls, to minimize the risk of exploiting this vulnerability. Mitigation For users who cannot immediately update the product, Mitsubishi Electric recommends using the IP filter function of the affected product to block access from untrusted hosts and minimize the risk of exploiting this vulnerability. For details on the IP filter function, refer to "13.1 IP Filter Function" in the MELSEC iQ-F FX5 User's Manual (Communication) which can be downloaded from the link "https://www.mitsubishielectric.com/fa/download/index.html." https://www.mitsubishielectric.com/fa/download/index.html Mitigation For users who cannot immediately update the product, Mitsubishi Electric recommends restricting physical access to the affected product, as well as to PCs and network devices to which it is connected, to minimize the risk of exploiting this vulnerability. Mitigation For users who cannot immediately update the product, Mitsubishi Electric recommends installing anti-virus software on PCs that can access the affected product, to minimize the risk of exploiting this vulnerability. Relevant CWE: CWE-190 Integer Overflow or Wraparound Metrics CVSS Version Base Score Base Severity Vector String 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 4.0 8.7 HIGH 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 Acknowledgments Mitsubishi Electric reported this vulnerability to CISA. Legal Notice and Terms of Use This product is provided subject to this Notification (https://www.cisa.gov/notification) and th