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Hitachi Energy AFS, AFR and AFF Series
Summary
Successful exploitation of this vulnerability could compromise the integrity of the product data and disrupt its availability.
The following versions of Hitachi Energy AFS, AFR and AFF Series are affected:
- AFS 660-B/C/S (CVE-2024-3596)
- AFS 665-B/S (CVE-2024-3596)
- AFS 670 v2.0 (CVE-2024-3596)
- AFS 650 (CVE-2024-3596)
- AFS 655 (CVE-2024-3596)
- AFS 670 (CVE-2024-3596)
- AFS 675 (CVE-2024-3596)
- AFS 677 (CVE-2024-3596)
- AFR 677 (CVE-2024-3596)
- AFF 660 (CVE-2024-3596)
- AFF 665 (CVE-2024-3596)
| CVSS | Vendor | Equipment | Vulnerabilities |
|---|---|---|---|
| v3 9 | Hitachi Energy | Hitachi Energy AFS, AFR and AFF Series | Improper Enforcement of Message Integrity During Transmission in a Communication Channel |
Background
- Critical Infrastructure Sectors: Energy
- Countries/Areas Deployed: Worldwide
- Company Headquarters Location: Switzerland
Vulnerabilities
CVE-2024-3596
The RADIUS protocol under RFC 2865 is susceptible to forgery attacks by a local attacker who can modify any valid response (access-accept, access-reject, or access-challenge) to any other response using a chosen-prefix collision attack against the MD5 response authenticator signature.
Affected Products
Hitachi Energy AFS, AFR and AFF Series
Vendor:
Hitachi Energy
Hitachi Energy
Product Version:
Hitachi Energy AFS 660-B/C/S: vers:all/*, Hitachi Energy AFS 665-B/S: vers:all/*, Hitachi Energy AFS 670 v2.0: vers:all/*, Hitachi Energy AFS 650: vers:all/*, Hitachi Energy AFS 655: vers:all/*, Hitachi Energy AFS 670: vers:all/*, Hitachi Energy AFS 675: vers:all/*, Hitachi Energy AFS 677: vers:all/*, Hitachi Energy AFR 677: vers:all/*, Hitachi Energy AFF 660: vers:all/*, Hitachi Energy AFF 665: vers:all/*
Hitachi Energy AFS 660-B/C/S: vers:all/*, Hitachi Energy AFS 665-B/S: vers:all/*, Hitachi Energy AFS 670 v2.0: vers:all/*, Hitachi Energy AFS 650: vers:all/*, Hitachi Energy AFS 655: vers:all/*, Hitachi Energy AFS 670: vers:all/*, Hitachi Energy AFS 675: vers:all/*, Hitachi Energy AFS 677: vers:all/*, Hitachi Energy AFR 677: vers:all/*, Hitachi Energy AFF 660: vers:all/*, Hitachi Energy AFF 665: vers:all/*
Product Status:
known_affected
known_affected
Remediations
Mitigation
Hitachi Energy has identified the following recommended immediate actions:
Mitigation
All affected products: Set the RADIUS configuration to default which enables the RADIUS server message authenticator option.
Vendor fix
AFR 677, AFS 650, AFS 655, AFS 670, AFS 675, AFS 677: Command to enable Message Authenticator option: For AFS65x, AFS67x, AFR67x CLI: radius server msgauth MIB: hmAgentRadiusServerMsgAuth
Vendor fix
AFF 660, AFF 665, AFS 660-B/C/S, AFS 665-B/S, AFS 670: Command to enable Message Authenticator option: For AFS66x, AFS670 v2.0, AFF66x CLI: radius server auth modify msgauth MIB: hm2AgentRadiusServerMsgAuth
Mitigation
For more information, see the associated Hitachi Energy PSIRT security advisory 8DBD000230 RADIUS vulnerability in Hitachi Energy AFS, AFR and AFF series products.
Relevant CWE: CWE-924 Improper Enforcement of Message Integrity During Transmission in a Communication Channel
Metrics
| CVSS Version | Base Score | Base Severity | Vector String |
|---|---|---|---|
| 3.1 | 9 | CRITICAL | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |
Acknowledgments
- Hitachi Energy 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 this Privacy & Use policy (https://www.cisa.gov/privacy-policy).
Recommended Practices
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 has a high attack complexity.
Revision History
- Initial Release Date: 2025-12-16
| Date | Revision | Summary |
|---|---|---|
| 2025-12-16 | 1 | Initial Publication |
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