CVE-2021-31410
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 · uneditedOverly relaxed configuration of frontend resources server in Vaadin Designer versions 4.3.0 through 4.6.3 allows remote attackers to access project sources via crafted HTTP request.
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 confidenceVaadin Designer versions 4.3.0-4.6.3 have a misconfigured frontend resources server that allows unauthorized remote access to project source files via crafted HTTP requests. This is an information disclosure vulnerability caused by overly permissive access controls on the frontend resources server.
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>= 4.3.0, < 4.6.4CVSS 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 the installed Vaadin Designer versionLocate the Vaadin Designer installation and check its version number (typically found in the application's about section, metadata, or installation directory). Compare the version against the affected range: 4.3.0 through 4.6.3.Affected if The installed version falls within 4.3.0 to 4.6.3 inclusive.
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Confirm the frontend resources server is enabledDetermine whether the frontend resources server feature is active or running in the Vaadin Designer environment. This is typically a built-in server component that serves design-time resources.Affected if The frontend resources server is enabled and running in the environment.
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Test for unauthorized file access via HTTPSend a crafted HTTP request to the frontend resources server endpoint attempting to access project source files outside the intended directory. Observe if the server returns files it should not expose.Affected if The server returns source files or directories that should be restricted from unauthenticated access.
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Review access control configurationInspect the access control settings or configuration files for the frontend resources server to determine if authentication or IP-based restrictions are properly enforced.Affected if Access controls are missing, misconfigured, or overly permissive.
You are affected if Vaadin Designer version 4.3.0-4.6.4 is installed with the frontend resources server enabled and accessible without proper authorization controls.
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 data4.6.4
Restrict access controls on the frontend resources server to prevent unauthorized access to project source files. Upgrade to Vaadin Designer version 4.6.4 or later if available.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-31410 — 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-2021-31410 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