OzoneApplication · Apache
CVE-2021-39234
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 · uneditedIn Apache Ozone versions prior to 1.2.0, Authenticated users knowing the ID of an existing block can craft specific request allowing access those blocks, bypassing other security checks like ACL.
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 confidenceApache Ozone versions before 1.2.0 contain an authorization bypass where authenticated users who know the ID of an existing block can craft specific requests to access those blocks, bypassing ACL security checks.
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
OzoneApplication
< 1.2.0CVSS 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
- High
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/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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Check if Apache Ozone is installedRun 'ozone version' or look for ozone binaries in common locations such as /usr/bin/ozone, /opt/ozone/, or check for ozone services running via 'systemctl list-units | grep ozone' or 'ps aux | grep ozone'Affected if Apache Ozone is not found in the environment, so this CVE does not apply
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Determine the installed Ozone versionExecute 'ozone version' or check the RPM/DEB package version with 'rpm -q ozone' or 'dpkg -l | grep ozone'Affected if The version number is lower than 1.2.0 (for example, 1.1.0, 1.0.0, or any 0.x release)
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Verify block access mechanism is in useCheck if Ozone block token service is enabled by reviewing ozone-site.xml for 'ozone.security.token.service.enabled' set to true, or check if the block ownership feature is activeAffected if Block token service or block ownership is enabled and the version is below 1.2.0, making the authorization bypass exploitable
You are affected if Apache Ozone version is below 1.2.0 and the block token/block ownership mechanism is enabled, allowing authenticated users to bypass ACLs when accessing blocks by ID.
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.
dbcve · scoped1.2.0
Upgrade Apache Ozone to version 1.2.0 or later to obtain the security fix.
1.2.0
- Verify the current Apache Ozone version using 'ozone version' or checking the installed package
- Review the Apache Ozone 1.2.0 release notes for any migration requirements or configuration changes
- Stop all Ozone services ( ozone datanode, ozone manager, ozone scm, ozone s3g, ozone recon)
- Back up the Ozone metadata directory and configuration files
- Upgrade Ozone packages to version 1.2.0 or later using the appropriate package manager or build system
- Update ozone-site.xml configuration if any new properties are required for 1.2.0
- Start Ozone services in the correct order: SCM first, then OM, then Datanodes and other services
- Verify the upgrade by checking service logs and running 'ozone admin info'
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Ozone
Scoped from the published advisory
- Consultation3.0 h
- Implementation6.0 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 $4,224.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-39234 — 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-2021-39234 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