CVE-2021-20423
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 Cloud Pak for Applications 4.3 could allow an authenticated user gain escalated privilesges due to improper application permissions. IBM X-Force ID: 196308.
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 Cloud Pak for Applications 4.3 contains a privilege escalation vulnerability where an authenticated user can gain elevated privileges due to improper application permission controls. The issue stems from insufficient validation of user permissions within the application's access control framework, allowing authenticated users to access functionality or data beyond their assigned role permissions.
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< 4.3.1CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 installed IBM Cloud Pak for Applications versionCheck the product version through the IBM Cloud Pak for Applications管理控制台 or by querying the operator deployment status using 'oc get cp4aapp --namespace <namespace> -o jsonpath="{.items[0].status.version}"' if using OpenShiftAffected if version is 4.3.0 or any 4.3.x version prior to 4.3.1
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Confirm RBAC feature is enabledReview the IBM Cloud Pak for Applications access control configuration through the admin console under Security or Access Management settings to determine if role-based access control is actively enforcedAffected if RBAC is enabled and the installed version is vulnerable (4.3.x before 4.3.1)
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Audit existing user role assignmentsExport or list all user role mappings from the application's identity provider or internal user registry to identify users with elevated permissionsAffected if any authenticated users exist in the system (the vulnerability allows privilege escalation for any authenticated user)
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Review permission configurations for custom rolesInspect role definitions and permission mappings in the application access control settings, looking for any role definitions that permit access beyond standard boundariesAffected if custom roles or permission sets are configured and the version is vulnerable
You are affected if IBM Cloud Pak for Applications is running any version 4.3.x prior to 4.3.1 and the application has authenticated users with role-based access control enabled.
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 · scoped4.3.1
Apply the vendor patch for CVE-2021-20423 when available, or engage IBM support for the fix. Review and enforce least-privilege principles in role-based access control (RBAC) configurations as an interim compensating control.
IBM Cloud Pak for Applications 4.3.1
- Back up current IBM Cloud Pak for Applications configuration and data
- Upgrade IBM Cloud Pak for Applications to version 4.3.1 or later
- Verify the upgrade completed successfully by checking the version number
- Confirm the proper permission assignments are in place post-upgrade
- Test that authenticated users no longer have escalated privileges
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation8.0 h
- Implementation16.0 h
- Testing12.0 h
- Review / QA8.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $12,352.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-20423 — 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-2021-20423 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