CVE-2025-66600 in FAST TOOLS
Summary
by MITRE • 02/09/2026
A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation.
This product lacks HSTS (HTTP Strict Transport Security) configuration. When an attacker performs a Man in the middle (MITM) attack, communications with the web server could be sniffed.
The affected products and versions are as follows: FAST/TOOLS (Packages: RVSVRN, UNSVRN, HMIWEB, FTEES, HMIMOB) R9.01 to R10.04
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Analysis
by VulDB Data Team • 02/09/2026
The vulnerability identified as CVE-2025-66600 affects FAST/TOOLS software products manufactured by Yokogawa Electric Corporation, specifically targeting versions R9.01 through R10.04. This security weakness resides in the absence of HTTP Strict Transport Security (HSTS) configuration within the web server components of these industrial automation systems. The affected packages include RVSVRN, UNSVRN, HMIWEB, FTEES, and HMIMOB, which are integral parts of Yokogawa's FAST/TOOLS suite designed for process automation and monitoring in industrial environments.
The technical flaw represents a critical deficiency in the web server's security posture, as HSTS is a crucial security mechanism that prevents protocol downgrade attacks and cookie hijacking by instructing browsers to only communicate via secure HTTPS connections. Without this configuration, the web server fails to enforce encrypted communication, leaving it vulnerable to man-in-the-middle attacks where malicious actors can intercept and potentially modify data transmitted between clients and the server. This vulnerability specifically impacts the web-based interfaces of these industrial systems, creating an attack surface that adversaries can exploit to gain unauthorized access to sensitive operational data and potentially compromise the integrity of industrial control systems.
The operational impact of this vulnerability extends beyond simple data interception, as it fundamentally undermines the security foundation of industrial automation systems that rely on these web interfaces for configuration, monitoring, and control operations. Attackers exploiting this weakness could potentially access confidential operational parameters, modify system configurations, or even disrupt industrial processes by manipulating data flows between human-machine interfaces and backend systems. The implications are particularly severe in industrial control environments where the integrity of communication channels is paramount for maintaining safe and reliable operations. This vulnerability aligns with CWE-311, which describes the absence of proper data protection mechanisms during transmission, and represents a significant risk to industrial cybersecurity frameworks that require robust network security controls.
Organizations utilizing affected FAST/TOOLS versions should implement immediate remediation measures including the configuration of HSTS headers on all web servers, ensuring that the security policy includes appropriate max-age values and includesSubDomains directives. Network segmentation and additional monitoring of web traffic should be implemented to detect potential exploitation attempts. The mitigation strategy should also include regular security assessments and vulnerability scanning of industrial control systems to identify similar configuration weaknesses. This vulnerability demonstrates the critical importance of implementing comprehensive security measures across all network components, particularly in industrial environments where cybersecurity breaches can have severe operational and safety implications. The issue also aligns with ATT&CK technique T1071.004, which covers application layer protocol: DNS, highlighting the need for proper transport layer security implementation to prevent protocol-based attacks. Organizations should also consider implementing additional security controls such as network intrusion detection systems and regular security audits to maintain a robust defense posture against evolving threats targeting industrial control systems.