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“Once a species enters, they never leave,” interior secretary says. But there’s more to the story.

View CSAF

1. EXECUTIVE SUMMARY

• CVSS v4 6.9
• ATTENTION: Exploitable remotely/low attack complexity
• Vendor: Mitsubishi Electric
• Equipment: MELSEC iQ-F Series CPU module
• Vulnerability: Missing Authentication for Critical Function

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to read or write the device values of the product. In addition, the attacker may be able to stop the operation of the programs.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Mitsubishi Electric reports the following versions of MELSEC iQ-F Series are affected:

• MELSEC iQ-F Series FX5U-32MT/ES: 1.060 and later
• MELSEC iQ-F Series FX5U-32MT/DS: 1.060 and later
• MELSEC iQ-F Series FX5U-32MT/ESS: 1.060 and later
• MELSEC iQ-F Series FX5U-32MT/DSS: 1.060 and later
• MELSEC iQ-F Series FX5U-64MT/ES: 1.060 and later
• MELSEC iQ-F Series FX5U-64MT/DS: 1.060 and later
• MELSEC iQ-F Series FX5U-64MT/ESS: 1.060 and later
• MELSEC iQ-F Series FX5U-64MT/DSS: 1.060 and later
• MELSEC iQ-F Series FX5U-80MT/ES: 1.060 and later
• MELSEC iQ-F Series FX5U-80MT/DS: 1.060 and later
• MELSEC iQ-F Series FX5U-80MT/ESS: 1.060 and later
• MELSEC iQ-F Series FX5U-80MT/DSS: 1.060 and later
• MELSEC iQ-F Series FX5U-32MR/ES: 1.060 and later
• MELSEC iQ-F Series FX5U-32MR/DS: 1.060 and later
• MELSEC iQ-F Series FX5U-64MR/ES: 1.060 and later
• MELSEC iQ-F Series FX5U-64MR/DS: 1.060 and later
• MELSEC iQ-F Series FX5U-80MR/ES: 1.060 and later
• MELSEC iQ-F Series FX5U-80MR/DS: 1.060 and later
• MELSEC iQ-F Series FX5UC-32MT/D: 1.060 and later
• MELSEC iQ-F Series FX5UC-32MT/DSS: 1.060 and later
• MELSEC iQ-F Series FX5UC-64MT/D: 1.060 and later
• MELSEC iQ-F Series FX5UC-64MT/DSS: 1.060 and later
• MELSEC iQ-F Series FX5UC-96MT/D: 1.060 and later
• MELSEC iQ-F Series FX5UC-96MT/DSS: 1.060 and later
• MELSEC iQ-F Series FX5UC-32MT/DS-TS: 1.060 and later
• MELSEC iQ-F Series FX5UC-32MT/DSS-TS: 1.060 and later
• MELSEC iQ-F Series FX5UC-32MR/DS-TS: 1.060 and later
• MELSEC iQ-F Series FX5UJ-24MT/ES: All versions
• MELSEC iQ-F Series FX5UJ-24MT/DS: All versions
• MELSEC iQ-F Series FX5UJ-24MT/ESS: All versions
• MELSEC iQ-F Series FX5UJ-24MT/DSS: All versions
• MELSEC iQ-F Series FX5UJ-40MT/ES: All versions
• MELSEC iQ-F Series FX5UJ-40MT/DS: All versions
• MELSEC iQ-F Series FX5UJ-40MT/ESS: All versions
• MELSEC iQ-F Series FX5UJ-40MT/DSS: All versions
• MELSEC iQ-F Series FX5UJ-60MT/ES: All versions
• MELSEC iQ-F Series FX5UJ-60MT/DS: All versions
• MELSEC iQ-F Series FX5UJ-60MT/ESS: All versions
• MELSEC iQ-F Series FX5UJ-60MT/DSS: All versions
• MELSEC iQ-F Series FX5UJ-24MR/ES: All versions
• MELSEC iQ-F Series FX5UJ-24MR/DS: All versions
• MELSEC iQ-F Series FX5UJ-40MR/ES: All versions
• MELSEC iQ-F Series ‘FX5UJ-40MR/DS: All versions
• MELSEC iQ-F Series FX5UJ-60MR/ES: All versions
• MELSEC iQ-F Series FX5UJ-60MR/DS: All versions
• MELSEC iQ-F Series FX5UJ-24MT/ES-A: All versions
• MELSEC iQ-F Series FX5UJ-24MR/ES-A: All versions
• MELSEC iQ-F Series FX5UJ-40MT/ES-A: All versions
• MELSEC iQ-F Series FX5UJ-40MR/ES-A: All versions
• MELSEC iQ-F Series FX5UJ-60MT/ES-A: All versions
• MELSEC iQ-F Series FX5UJ-60MR/ES-A: All versions
• MELSEC iQ-F Series FX5S-30MT/ES: All versions
• MELSEC iQ-F Series FX5S-30MT/DS: All versions
• MELSEC iQ-F Series FX5S-30MT/ESS: All versions
• MELSEC iQ-F Series FX5S-30MT/DSS: All versions
• MELSEC iQ-F Series FX5S-40MT/ES: All versions
• MELSEC iQ-F Series FX5S-40MT/DS: All versions
• MELSEC iQ-F Series FX5S-40MT/ESS: All versions
• MELSEC iQ-F Series FX5S-40MT/DSS: All versions
• MELSEC iQ-F Series FX5S-60MT/ES: All versions
• MELSEC iQ-F Series FX5S-60MT/DS: All versions
• MELSEC iQ-F Series FX5S-60MT/ESS: All versions
• MELSEC iQ-F Series FX5S-60MT/DSS: All versions
• MELSEC iQ-F Series FX5S-80MT/ES: All versions
• MELSEC iQ-F Series FX5S-80MT/DS: All versions
• MELSEC iQ-F Series FX5S-80MT/ESS: All versions
• MELSEC iQ-F Series FX5S-80MT/DSS: All versions
• MELSEC iQ-F Series FX5S-30MR/ES: All versions
• MELSEC iQ-F Series FX5S-30MR/DS: All versions
• MELSEC iQ-F Series FX5S-40MR/ES: All versions
• MELSEC iQ-F Series FX5S-40MR/DS: All versions
• MELSEC iQ-F Series FX5S-60MR/ES: All versions
• MELSEC iQ-F Series FX5S-60MR/DS: All versions
• MELSEC iQ-F Series FX5S-80MR/ES: All versions
• MELSEC iQ-F Series FX5S-80MR/DS: All versions

3.2 VULNERABILITY OVERVIEW

3.2.1 MISSING AUTHENTICATION FOR CRITICAL FUNCTION CWE-306

An information disclosure, information tampering, and denial-of-service vulnerability exists in MELSEC iQ-F series CPU module due to missing authentication for critical function. Since MODBUS/TCP in the products does not have authentication features, an attacker may be able to read or write the device values of the product. In addition, the attacker may be able to stop the operation of the programs.

CVE-2025-7405 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.3 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

A CVSS v4 score has also been calculated for CVE-2025-7405. A base score of 6.9 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/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

Thai Do, Minh Pham, Quan Le and Loc Nguyen of Unit 515, OPSWAT reported this vulnerability to Mitsubishi Electric.

4. MITIGATIONS

Mitsubishi Electric Corporation advises that there are no plans to release a fixed version. Mitsubishi Electric recommends users take the following mitigation measures to minimize the risk of vulnerability exploit:

• Use a firewall or 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.
• Use IP filter function to block access from untrusted hosts. For details on the IP filter function, please refer to the following manual for each product.
  “13.1 IP Filter Function” in the MELSEC iQ-F FX5 User’s Manual (Communication) Please download the manual from the following URL.
  https://www.mitsubishielectric.com/fa/download/index.html
• Restrict physical access to the affected products and the LAN that is connected by them.

Mitsubishi Electric Corporation recommends users contact their local Mitsubishi Electric representative with questions.

For more information, see Mitsubishi Electric’s security advisory.

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

No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.

5. UPDATE HISTORY

• August 28, 2025: Initial Republication of Mitsubishi Electric 2025-011

View CSAF

1. EXECUTIVE SUMMARY

• CVSS v3 6.7
• ATTENTION: Low Attack Complexity
• Vendor: Schneider Electric
• Equipment: Saitel DR RTU, Saitel DP RTU
• Vulnerability: Improper Privilege Management

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an authenticated attacker to escalate privileges, potentially leading to arbitrary code execution.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Schneider Electric reports that the following products are affected:

• Schneider Electric Saitel DR RTU: versions 11.06.29 and prior
• Schneider Electric Saitel DP RTU: versions 11.06.34 and prior

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER PRIVILEGE MANAGEMENT CWE-269

An improper privilege management vulnerability exists that could cause privilege escalation and arbitrary code execution when a privileged engineer user with console access modifies a configuration file used by a root-level daemon to execute custom scripts.

CVE-2025-8453 has been assigned to this vulnerability. A CVSS v3.1 base score of 6.7 has been calculated; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Communications, Critical Manufacturing, Energy, Transportation Systems
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: France

3.4 RESEARCHER

Robin Senn and Sebastian Krause of GAI NetConsult GmbH reported this vulnerability to Schneider Electric.

Schneider Electric reported this vulnerability to CISA.

4. MITIGATIONS

Schneider Electric has identified the following specific workarounds and mitigations users can apply to reduce risk:

• Schneider Electric Saitel DR RTU: HUe Firmware version 11.06.30 includes a fix for this vulnerability and is available for download here.
• Schneider Electric Saitel DR RTU: If users choose not to apply the remediation provided above, they should immediately apply the following mitigations to reduce the risk of exploit:
  • Limit physical or console access to trusted users only.
  • Ensure that configuration files used by privileged daemons are owned by root, not writable by non-privileged users, and set to minimum permissions when technically feasible to prevent unauthorized modification.
• Schneider Electric Saitel DP RTU: Schneider Electric is establishing a remediation plan for the Saitel DP RTU product that will include a fix for this vulnerability. We will update this document when the remediation is available. Until then, users should immediately apply the following mitigations to reduce the risk of exploit:
  • Limit physical or console access to trusted users only.
  • Enforce password policy (strong password and update password regularly). Password updates can be applied using the EcoStruxure Cybersecurity Admin Expert tool, or device webpage.
  • Users should also consider upgrading to the latest product offering PowerLogic T500 Substation Controller

For more information see the associated Schneider Electric CPCERT security advisory SEVD-2025-224-01 Saitel DR & Saitel DP Remote Terminal Unit – SEVD-2025-224-01 PDF Version, Saitel DR & Saitel DP Remote Terminal Unit – SEVD-2025-224-01 CSAF Version.

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.
• 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 this vulnerability has been reported to CISA at this time. This vulnerability is not exploitable remotely.

5. UPDATE HISTORY

• August 28, 2025: Initial Republication of Schneider Electric CPCERT SEVD-2025-224-01

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