CVE-2021-20624
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 access control vulnerability in Scheduler of Cybozu Office 10.0.0 to 10.8.4 allows an authenticated attacker to bypass access restriction and alter the data of Scheduler 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 access control vulnerability in Cybozu Office's Scheduler component (versions 10.0.0-10.8.4) allows authenticated attackers to bypass access restrictions and modify Scheduler data due to insufficient authorization checks in unspecified entry points.
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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Confirm Cybozu Office installationLocate Cybozu Office installation directory or identify running Cybozu processes on the systemAffected if Cybozu Office is not installed on the system
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Identify installed Cybozu Office versionAccess the Cybozu Office administrator settings page or check version information file in the installation directoryAffected if Version cannot be determined or is within 10.0.0 to 10.8.4 inclusive
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Verify Scheduler component is enabledLog into Cybozu Office as an administrator and navigate to the system settings or application management section to confirm the Scheduler module is activeAffected if Scheduler component is enabled and in use
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Confirm user authentication is possibleVerify that user authentication mechanisms are configured and functional in Cybozu OfficeAffected if Authenticated users exist who could potentially access the Scheduler
The environment is affected if Cybozu Office version 10.0.0 through 10.8.4 is installed with the Scheduler component enabled, as authenticated attackers could exploit improper authorization checks to modify Scheduler data.
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 dataUpgrade to Cybozu Office version 10.8.5 or later which contains the patched access control mechanisms; review Scheduler permission models and implement additional authorization validation as a defense-in-depth measure.
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-20624 — 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-2021-20624 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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