CVE-2021-44163
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 · uneditedChain Sea ai chatbot backend has improper filtering of special characters in URL parameters, which allows a remote attacker to perform JavaScript injection for XSS (reflected Cross-site scripting) attack without authentication.
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 · high confidenceChain Sea ai chatbot backend fails to properly filter or sanitize special characters in URL parameters, allowing an attacker to inject malicious JavaScript code. This reflected XSS vulnerability is exploitable remotely without authentication by crafting URLs containing script injection payloads.
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 dataall versionsCVSS 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 Chinasea Qb Smart Service Robot deploymentLocate and confirm the Chinasea Qb Smart Service Robot system in your environment. Check network inventories, asset management systems, or physically locate the robot device.Affected if The Chinasea Qb Smart Service Robot is deployed and accessible on your network.
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Locate the chatbot backend URLIdentify the HTTP endpoint used by the robot's ai chatbot backend. This is typically accessible via the robot's web interface or API. Check for URLs paths containing terms like 'chat', 'bot', 'query', or 'api' in the robot's web service.Affected if The chatbot backend endpoint is accessible over HTTP/HTTPS.
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Test URL parameter reflectionSend an HTTP request to the chatbot backend with a benign XSS test payload in a URL parameter, such as ?message=<script>alert(1)</script> or ?input=test<script>alert(1)</script>. Capture the HTTP response and examine if the payload appears unescaped in the response body.Affected if The injected <script> tags or HTML special characters are reflected in the response without being encoded or escaped (e.g., still shows as <script> rather than <script>).
Your environment is affected if the Chinasea Qb Smart Service Robot is deployed and its chatbot backend reflects URL parameter input back to the user without encoding special characters, allowing script injection.
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 proper input validation and output encoding for all URL parameters in the chatbot backend. Apply context-aware escaping before reflecting any user input in HTTP responses.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 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 $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-44163 — 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-2021-44163 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
- No spam, self-promotion, credentials, or personal data