CVE-2019-17663
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 · uneditedD-Link DIR-866L 1.03B04 devices allow XSS via HtmlResponseMessage in the device common gateway interface, leading to common injection.
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 confidenceCross-site scripting (XSS) vulnerability in D-Link DIR-866L firmware 1.03B04 allows injection of malicious scripts through the HtmlResponseMessage parameter in the device's common gateway interface (CGI). The vulnerability stems from insufficient input validation or output encoding when handling the HtmlResponseMessage field, allowing an attacker to inject arbitrary HTML or JavaScript that executes in the context of the victim's browser when viewing the affected page.
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= 1.03b04CVSS 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
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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 the device modelCheck the physical device label or access the router's admin interface and look for the model number in the status or system information pageAffected if The device is not a D-Link DIR-866L
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Check the firmware versionAccess the router's web admin interface, typically at 192.168.0.1, and navigate to the Status or System section to view the firmware version displayedAffected if The firmware version is exactly 1.03B04
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Verify the CGI web interface is accessibleAttempt to access the router's CGI endpoint by navigating to the web interface login page or checking if port 80/443 is open on the deviceAffected if The router's web administration interface is accessible on the network
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Confirm the HtmlResponseMessage parameter handlingInspect the source code of any CGI-handled pages or check the device's HTTP responses for the HtmlResponseMessage parameter in the request/response flowAffected if The device processes the HtmlResponseMessage parameter through its CGI interface without sanitization
A user is affected if they have a D-Link DIR-866L router running exactly firmware version 1.03B04 with the web interface accessible on their network.
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 firmware updates when available; until then, restrict administrative interface access to trusted networks only and monitor for suspicious requests targeting the CGI endpoint.
- Consultation2.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-17663 — 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-2019-17663 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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- 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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