CVE-2021-20429
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 · uneditedIBM QRadar User Behavior Analytics 1.0.0 through 4.1.0 could disclose sensitive information due an overly permissive cross-domain policy. IBM X-Force ID: 196334.
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 confidenceIBM QRadar User Behavior Analytics contains an overly permissive cross-domain policy (likely a CORS misconfiguration) that allows unauthorized cross-origin access to sensitive information. This enables attackers to make requests from malicious websites and potentially exfiltrate data that should be protected by same-origin restrictions.
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>= 1.0.0, < 4.1.1CVSS 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:3.1/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.
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Verify IBM QRadar UBA is installedIdentify if IBM QRadar User Behavior Analytics is deployed in your environment. Check for the application service or consult your systems inventory.Affected if The product is present in the environment
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Determine installed versionLocate and read the installed version of IBM QRadar UBA. This is typically available via the product's web interface, admin console, or by querying the application service.Affected if The installed version falls within the range >=1.0.0 and <4.1.1
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Inspect CORS configurationExamine the web server or application configuration that controls cross-origin requests. Look for Access-Control-Allow-Origin header settings or cross-domain policy files.Affected if The configuration allows wildcard origins (*) or does not validate the Origin header against an explicit whitelist
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Review exposed endpointsIdentify API endpoints or resources accessible via HTTP that may return sensitive user behavior data. Check whether these endpoints are protected by same-origin policy or accept cross-origin requests without proper validation.Affected if Sensitive endpoints accept cross-origin requests from untrusted domains without validation
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Validate origin validation logicExamine server-side code or configuration that handles the Origin header. Determine whether incoming requests are validated against a defined whitelist of allowed origins.Affected if The server does not perform strict Origin header validation or relies solely on client-side checks
You are affected if IBM QRadar UBA version is between 1.0.0 and 4.1.0 (exclusive) AND the cross-domain policy permits access from arbitrary origins without proper validation.
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 data4.1.1
Restrict the cross-domain policy by explicitly whitelisting legitimate origins, validating the Origin header server-side, and limiting exposed sensitive data. Update to a patched version if available or apply vendor-provided configuration guidance.
- Consultation2.0 h
- Implementation2.0 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-2021-20429 — 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-2021-20429 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
- No spam, self-promotion, credentials, or personal data