CVE-2025-66635
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 · uneditedStack-based buffer overflow vulnerability exists in SEIKO EPSON Web Config. Specially crafted data input by a logged-in user may execute arbitrary code. As for the details of the affected products and versions, see the information provided by the vendor under [References].
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 confidenceA stack-based buffer overflow vulnerability exists in SEIKO EPSON Web Config that allows a logged-in (authenticated) user to execute arbitrary code through specially crafted data input. The vulnerability stems from insufficient bounds checking when processing user input in the web interface.
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
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/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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Identify EPSON device with Web ConfigAccess the device's web interface by entering its IP address in a browser. If a login page or Epson configuration interface appears, the device has Web Config enabled.Affected if The device presents a SEIKO EPSON Web Config login or configuration page.
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Verify Web Config is reachable on the networkCheck if the web interface is accessible by attempting HTTP/HTTPS connections to the device's IP address on common ports (80, 443, 8080). Use 'curl -k https://[DEVICE_IP]' or a browser.Affected if Web Config responds to network requests.
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Confirm authentication is requiredAttempt to access protected pages or features without logging in. If redirected to a login page or denied access, authentication is enforced.Affected if The Web Config requires login credentials before allowing access to configuration functions.
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Determine firmware versionLog into Web Config and navigate to the status, information, or maintenance section. Look for a firmware version, build number, or model number displayed on the dashboard or in system information pages.Affected if The installed firmware version falls within any affected ranges once published by the vendor.
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Check for signs of compromiseReview device logs accessible through Web Config or system logs for unexpected entries, failed authentication attempts from unknown IPs, or configuration changes made by unrecognized accounts.Affected if Logs show unauthorized access attempts, unexpected configuration changes, or execution of unknown commands.
A user is affected if they have a SEIKO EPSON device with an accessible Web Config interface and the installed firmware version falls within the affected range once the vendor publishes specific version details.
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 dataApply vendor-supplied firmware/security updates for affected EPSON devices once released. Until then, limit Web Config access to trusted users only and monitor for suspicious activity.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-66635 — 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-2025-66635 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
- No spam, self-promotion, credentials, or personal data