CVE-2025-66600
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Missing HSTS in Yokogawa FAST/TOOLS Enables MITM Attacks

Publication date: 2026-02-09

Last updated on: 2026-02-09

Assigner: YokogawaGroup

Description
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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Meta Information
Published
2026-02-09
Last Modified
2026-02-09
Generated
2026-06-16
AI Q&A
2026-02-09
EPSS Evaluated
2026-06-14
NVD
CVE-2025-66600
EUVD
EUVD-2025-207173
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
yokogawa electric_corporation From R9.01 (inc) to R10.04 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-358 The product does not implement or incorrectly implements one or more security-relevant checks as specified by the design of a standardized algorithm, protocol, or technique.
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Executive Summary

This vulnerability affects the FAST/TOOLS product by Yokogawa Electric Corporation, specifically versions R9.01 to R10.04. The issue is the lack of HTTP Strict Transport Security (HSTS) configuration in the product.

Without HSTS, when an attacker performs a Man-in-the-Middle (MITM) attack, they can intercept and sniff communications between the client and the web server, potentially capturing sensitive data.

Impact Analysis

The lack of HSTS configuration allows attackers to perform Man-in-the-Middle (MITM) attacks, which can lead to interception and eavesdropping on communications with the web server.

This means sensitive information transmitted over the network could be exposed to unauthorized parties, increasing the risk of data theft or manipulation.

Compliance Impact

I don't know

Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability is due to the lack of HTTP Strict Transport Security (HSTS) configuration in the FAST/TOOLS web server, which allows Man-in-the-Middle (MITM) attacks to sniff communications.'}, {'type': 'paragraph', 'content': "To detect this vulnerability on your system, you can check the HTTP response headers from the FAST/TOOLS web server to see if the 'Strict-Transport-Security' header is missing."}, {'type': 'paragraph', 'content': 'Suggested commands to detect the absence of HSTS header include using curl or similar tools:'}, {'type': 'list_item', 'content': 'curl -I https://[target-server] | grep -i Strict-Transport-Security'}, {'type': 'list_item', 'content': 'If the command returns no output, it indicates that HSTS is not configured, confirming the vulnerability.'}] [1]

Mitigation Strategies

Yokogawa recommends upgrading affected FAST/TOOLS versions to R10.04 and applying patch CS_e12787 after installing R10.04 SP3 to mitigate this and other vulnerabilities.

Additionally, enabling HTTP Strict Transport Security (HSTS) on the web server configuration will help prevent Man-in-the-Middle attacks by enforcing secure HTTPS connections.

Customers should assess their system environments and apply the provided patches accordingly. Yokogawa offers support for applying these countermeasures and other cybersecurity measures.

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