CVE-2018-4321
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 · uneditedA validation issue existed in the entitlement verification. This issue was addressed with improved validation of the process entitlement. This issue affected versions prior to iOS 12, macOS Mojave 10.14, tvOS 12.
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 confidenceThis is an entitlement validation bypass vulnerability in Apple's process entitlement verification system. The flaw allowed processes to potentially obtain or bypass entitlements they were not authorized to have, due to insufficient validation during the entitlement check 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< 12.0< 10.14< 12CVSS 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.
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Check iOS version on iPhone or iPadGo to Settings > General > About > Version, or run 'sw_vers' via terminal if you have a Mac with Xcode tools, or check via MDM/enterprise management toolsAffected if The version displayed is earlier than 12.0 (for example, 11.4.1)
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Check macOS version on Mac computersClick the Apple menu > About This Mac, or run 'sw_vers' in TerminalAffected if The version displayed is earlier than 10.14 (such as 10.13.6)
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Check tvOS version on Apple TVGo to Settings > General > About > Version, or check via Apple Configurator or MDM if managedAffected if The version displayed is earlier than 12 (for example, 11.4)
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Identify the primary Apple platform in useDetermine whether the managed devices are iPhones/iPads, Macs, or Apple TVs; each has its own version trackingAffected if Any device runs an affected OS version (iOS < 12.0, macOS < 10.14, tvOS < 12) regardless of other configurations
A system is affected if it runs any iOS, macOS, or tvOS version earlier than the fixed releases (iOS 12.0+, macOS 10.14+, tvOS 12+) because the entitlement validation flaw exists in those older OS versions.
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 data10.141212.0
Apply the vendor-supplied updates: upgrade to iOS 12 or later, macOS Mojave 10.14 or later, or tvOS 12 or later to obtain the improved process entitlement validation.
- Consultation1.0 h
- Implementation2.0 h
- Testing1.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-4321 — 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-2018-4321 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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