CVE-2025-66606
Yokogawa Fast\/Tools r9.01 – r10.04
Raw vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XSummary
CVE-2025-66606 is a low-severity Improper Neutralization of Invalid Characters in Identifiers in Web Pages (CWE-86) vulnerability in Yokogawa Fast\/Tools. Its CVSS base score is 2.1 (Low).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 12th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to SI-10 (Information Input Validation) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2025-66606 affects FAST/TOOLS software provided by Yokogawa Electric Corporation, specifically the packages RVSVRN, UNSVRN, HMIWEB, FTEES, and HMIMOB in versions R9.01 to R10.04. The vulnerability arises from improper URL encoding, classified under CWE-86, enabling attackers to tamper with web pages or execute malicious scripts. Published on 2026-02-09, it carries a CVSS v3.1 base score of 9.6 (AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H), indicating critical severity due to its network accessibility, low complexity, and high impacts across confidentiality, integrity, and availability.
An unauthenticated attacker can exploit this vulnerability remotely over the network with low attack complexity, though it requires user interaction, such as a victim clicking a malicious link or visiting a crafted URL. Exploitation changes the security scope, allowing the attacker to achieve high-level compromise, including execution of arbitrary scripts, web page manipulation, and potential full control over the affected FAST/TOOLS instance.
Yokogawa's security advisory YSAR-26-0001-E, accessible at https://web-material3.yokogawa.com/1/39206/files/YSAR-26-0001-E.pdf, provides details on the vulnerability. Security practitioners should consult this reference for recommended mitigations, patches, or workarounds specific to the affected versions.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-207165
Vulnerability Data
A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation. This product does not properly encode URLs. An attacker could tamper with web pages or execute malicious scripts. The affected products and versions are as follows: FAST/TOOLS (Packages:…
more
RVSVRN, UNSVRN, HMIWEB, FTEES, HMIMOB) R9.01 to R10.04
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Input validation directly stops invalid characters from being accepted in identifiers and tag/URI contexts.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Secure SDLC practices directly require proper input neutralization and validation to prevent identifier-handling flaws.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Security testing can detect the weakness but does not itself implement the neutralization controls.
Secure development life cycle mandates input validation and sanitization that directly prevents improper neutralization of invalid characters in identifiers.
Application security requirements explicitly call for validation of all inputs including identifiers, mitigating this weakness.
Secure coding standards require proper neutralization of invalid characters in tag names, URIs and identifiers, directly addressing CWE-86.