CVE-2025-66604 — Cleartext Transmission of Sensitive Information in Yokogawa Fast/tools
A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation. The library version could be displayed on the web page. This information could be exploited by an attacker for other attacks. The affected products and versions are as follows: FAST/TOOLS (Packages: RVSVRN, UNSVRN, HMIWEB, FTEES, HMIMOB) R9.01 to R10.04
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- EPSS 0.1% (30-day exploitation probability)+0
- Technical severity (medium)+3
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
CISA SSVC assessment CISA
Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Yokogawa Fast/tools, Yokogawa Electric Corporation FAST/TOOLS).
- The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
- No fix documented in the sources: reduce exposure and monitor the vendor advisory.
- Search available logs for exploit probes matching the vulnerability class (cryptography), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Yokogawa | Fast/tools | ≥ r9.01 and ≤ r10.04 | Vulnerable | NIST National Vulnerability Database |
| Yokogawa Electric Corporation | FAST/TOOLS | ≥ R9.01 and ≤ R10.04 | Vulnerable | CVE Program (cve.org) e CISA ADP |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 2.1 | CVSS 4.0 | Low | — | — | 7168b535-132a-4efe-a076-338f829b2eb9 via NIST National Vulnerability Database |
| 2.1 | CVSS 4.0 | Low | — | — | YokogawaGroup via CVE Program (cve.org) e CISA ADP |
| 5.3 | CVSS 3.1 | Medium | 3.9 | 1.4 | nvd@nist.gov via NIST National Vulnerability Database |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N (score shown at the top: nvd@nist.gov) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
EPSS over time FIRST
Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.14%
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
- Check TLS negotiations and unexpected certificates in the component’s traffic.
Timeline
What happened to this CVE, newest first.
- 2026
- Affected products added · yokogawa electric corporation/fast/tools
- SSVC assessment updated
- Record published
- CVSS changed · 5.3
- Source status changed · → Analyzed
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× Official description updated · Oct 13, 2026 – Oct 13, 2026
References
1 on the record
Elsewhere on this site
Related CVEs (same products)
- High CVE-2026-11833 Cleartext Transmission of Sensitive Information in Yokogawa Electric Corporation FAST/TOOLS Jun 22, 2026
- High CVE-2025-66597 Use of a Broken or Risky Cryptographic Algorithm in Yokogawa Fast/tools Feb 9, 2026
- High CVE-2025-66598 Use of a Broken or Risky Cryptographic Algorithm in Yokogawa Fast/tools Feb 9, 2026
- Medium CVE-2025-66596 Open Redirect in Yokogawa Fast/tools Feb 9, 2026
- Medium CVE-2025-66595 Cross-Site Request Forgery (CSRF) in Yokogawa Fast/tools Feb 9, 2026
- Medium CVE-2025-66594 Information Exposure Through an Error Message in Yokogawa Fast/tools Feb 9, 2026
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No fixed version, patch or mitigation documented.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2025-66604 is "Cleartext Transmission of Sensitive Information in Yokogawa Fast/tools", rated Medium. It affects Fast/tools (Yokogawa); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 5.3 describes technical severity. EPSS 0.14% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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