CVE-2021-21012
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 · uneditedMagento versions 2.4.1 (and earlier), 2.4.0-p1 (and earlier) and 2.3.6 (and earlier) are vulnerable to an insecure direct object vulnerability (IDOR) in the checkout module. Successful exploitation could lead to sensitive information disclosure.
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 confidenceMagento versions 2.4.1 and earlier contain an Insecure Direct Object Reference (IDOR) vulnerability in the checkout module that allows unauthorized users to access sensitive customer information by manipulating object references during the checkout process.
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<= 2.3.6= 2.4.0= 2.4.1<= 2.3.6= 2.4.0= 2.4.1CVSS 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
- Low
- Integrity
- None
- Availability
- None
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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.
-
Determine installed Magento versionRun 'bin/magento --version' from the Magento root directory, or inspect the 'composer.json' file for the 'version' field under 'require' for 'magento/product-community-edition' or 'magento/product-enterprise-edition'Affected if The version displayed is 2.3.6 or earlier, 2.4.0, or 2.4.1 (Commerce or Open Source editions)
-
Verify checkout module is enabledRun 'bin/magento module:status' and check if Magento_Checkout module is listed as enabled, or inspect the config.php file in app/etc for the module entryAffected if The checkout module is enabled (this is the default state for most Magento installations)
-
Identify checkout API endpoints handling customer dataReview the API configuration files in the module, typically under app/code/Magento/Checkout/etc/webapi.xml or api.xml to locate endpoints that return customer informationAffected if Endpoints exist that accept object IDs (such as quote IDs or order IDs) without requiring authenticated session context
-
Inspect checkout controller for authorization validationExamine the controller classes in app/code/Magento/Checkout/Controller/ that handle data retrieval requests. Look for implementation of \Magento\Framework\App\Action\HttpGetActionInterface or similar, and check if \Magento\Customer\Model\Session::isLoggedIn() or similar authorization checks are performed before returning dataAffected if The code does not validate that the requesting user owns or is authorized to access the referenced customer data object
You are affected if your Magento installation runs version 2.3.6 or earlier, 2.4.0, or 2.4.1 and the checkout module is enabled, with checkout endpoints lacking proper ownership validation on object references.
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 dataApply the official Magento security patch or upgrade to a patched version. Implement proper authorization checks in checkout module endpoints to validate user permissions before returning sensitive data.
- Consultation3.0 h
- Implementation6.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,992.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-21012 — 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-2021-21012 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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