CVE-2021-20631
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 · uneditedImproper input validation vulnerability in Custom App of Cybozu Office 10.0.0 to 10.8.4 allows authenticated attacker to alter the data of Custom App via unspecified vectors.
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 confidenceImproper input validation vulnerability in the Custom App feature of Cybozu Office versions 10.0.0 through 10.8.4 allows authenticated attackers to alter Custom App data through unspecified vectors. The vulnerability stems from inadequate validation of user-supplied input before it is processed, potentially enabling data manipulation.
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>= 10.0.0, <= 10.8.4CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/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 Cybozu Office versionAccess the system administration panel or check the product version through the help/about section in Cybozu Office. The version is typically displayed in the system settings or footer of the administrative interface.Affected if The installed version falls within the range 10.0.0 through 10.8.4 (versions below 10.8.5).
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Confirm Custom App feature is activeNavigate to the Custom App management section within the Cybozu Office administration interface. Check if any custom applications have been created or if the Custom App module is enabled in the system.Affected if The Custom App feature is enabled or has custom applications configured in the system.
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Review user access to Custom AppExamine the user permissions and access controls for the Custom App functionality through the administration panel. Check which users or groups have permission to create or modify custom applications.Affected if There are users with access to the Custom App feature, particularly those with create or edit permissions.
If Cybozu Office version is 10.0.0 through 10.8.4 AND the Custom App feature is enabled with active users, the environment is potentially affected by this vulnerability.
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 dataUpdate Cybozu Office to version 10.8.5 or later, which contains the patch for this vulnerability. Until patching is possible, limit access to the Custom App functionality to trusted users only.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-20631 — 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-2021-20631 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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