CVE-2025-66597
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation. This product supports weak cryptographic algorithms, potentially allowing an attacker to decrypt communications with the web server. The affected products and versions are as follows: FAST/TOOLS (Packages: RVSVRN, UNSVRN, HMIWEB, FTEES, HMIMOB) R9.01 to R10.04
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThe FAST/TOOLS web server supports weak cryptographic algorithms (such as outdated cipher suites), potentially allowing man-in-the-middle attackers to intercept and decrypt sensitive communications via cryptographic downgrade attacks or known algorithm weaknesses.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data>= r9.01, <= r10.04CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify Fast/TOOLS versionLocate the Fast/TOOLS installation and determine the installed version number, typically accessible via the application itself, installation directory, or system information.Affected if Installed version falls within r9.01 to r10.04 (inclusive)
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Check enabled TLS protocolsAccess the Fast/TOOLS web server configuration settings or configuration files and identify which TLS protocol versions are enabled (TLS 1.0, TLS 1.1, TLS 1.2, TLS 1.3).Affected if TLS 1.0 or TLS 1.1 is enabled on the web server
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Review configured cipher suitesInspect the web server cipher suite configuration to list all accepted encryption algorithms. Look for the presence of weak or deprecated ciphers such as 3DES, RC4, or other known-weak cipher suites.Affected if Weak cipher suites (such as 3DES, RC4) are among the enabled cipher suites
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Validate server cipher supportUse an SSL/TLS testing tool (such as openssl s_client or a dedicated scanner) to connect to the Fast/TOOLS web server endpoint and enumerate the supported cipher suites and protocols.Affected if Testing reveals the server accepts weak ciphers or outdated TLS protocols
The environment is affected if Fast/TOOLS version r9.01 through r10.04 is running with weak cipher suites or outdated TLS protocols (1.0/1.1) enabled on the web server.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataDisable weak cryptographic algorithms (e.g., legacy ciphers like TLS 1.0/1.1, 3DES, RC4) and configure the web server to use only strong cipher suites (TLS 1.2/1.3 with AES-GCM). Apply vendor patches for affected versions R9.01-R10.04 if available.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-66597 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-66597 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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