CVE-2025-40943
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 · uneditedAffected devices do not properly sanitize contents of trace files. This could allow an attacker to inject code through social engineering an authorized user, who has the function right "Read diagnostics", to import a specially crafted trace file. The malicious trace file is insufficiently sanitized and malicious code could be executed in the clients browser session and trigger PLC operations via the webserver that the legitimate user is authorized to perform.
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 confidenceThis is a stored cross-site scripting (XSS) vulnerability in the trace file import functionality. Devices fail to sanitize trace file contents before processing, allowing an attacker to embed malicious JavaScript. When a legitimate user with 'Read diagnostics' permission imports the crafted file, the code executes in their browser context and can trigger authorized PLC operations via the webserver (CSRF-style attack).
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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
- Required
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
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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Verify trace file import feature accessNavigate to the web interface diagnostics or trace section and confirm whether a trace file import/upload option is present and accessible to your user accountAffected if The trace file import feature is enabled and accessible in the web interface
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Confirm Read diagnostics permissionCheck your current user account permissions or role settings to determine if the 'Read diagnostics' permission or equivalent diagnostics read access is grantedAffected if Your account has 'Read diagnostics' permission enabling access to trace file functionality
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Check product versionLocate the product firmware or software version information typically found in system settings, about page, or diagnostics panel. Compare against any vendor-released version information for CVE-2025-40943Affected if The installed version matches or falls within any vendor-identified vulnerable version range
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Inspect trace file handling configurationReview the web server or application configuration files related to trace file processing to confirm whether input validation or sanitization is implemented for imported trace filesAffected if No input validation or sanitization is configured for trace file contents
You are affected if the trace file import feature is accessible to a user with 'Read diagnostics' permission on a vulnerable version without proper trace file content sanitization.
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 dataImplement strict input validation and output encoding for all trace file content before rendering. Consider adding CSRF tokens for state-changing operations and implementing Content Security Policy headers.
- Consultation4.0 h
- Implementation16.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,960.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-40943 — 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-2025-40943 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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- Version or environment caveats, and links to real fixes
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