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Iphone OsOperating system · Apple

CVE-2018-4427

HIGH · 7.8 CVSS v3.0 Published 2019-04-03
Fix available
A fix is available. Upgrade to 5.1.2 / 10.14.2 or later.
See remediation →
81/100
Remediation priority · High
No privileges

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 · unedited
A memory corruption issue was addressed with improved memory handling. This issue affected versions prior to: iOS 12.1, watchOS 5.1.2, tvOS 12.1.1, macOS High Sierra 10.13.6 Security Update 2018-003 High Sierra, macOS Sierra 10.12.6 Security Update 2018-006.

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 confidence

A memory corruption vulnerability in multiple Apple operating systems (iOS, watchOS, tvOS, macOS) that was addressed through improved memory handling. The specific component or exploitation vector is not detailed in the available description.

MitigationApply the available security updates: iOS 12.1 or later, watchOS 5.1.2 or later, tvOS 12.1.1 or later, or the respective macOS Security Updates 2018-003/2018-006 for High Sierra and Sierra.

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
Iphone OsOperating system
Affected:< 12.1
Mac Os XOperating system
Affected:< 10.14.2
TvosOperating system
Affected:< 12.1.1
WatchosOperating system
Affected:< 5.1.2

CVSS 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
Local
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/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 checks

Work through these to decide whether this CVE applies to you.

  1. Check macOS version
    Open System Preferences > About This Mac, or run 'sw_vers' in Terminal
    Affected if Version is below 10.14.2 (e.g., 10.14.1, 10.14.0, or earlier)
  2. Check iOS version
    Go to Settings > General > About > Version on the iPhone or iPad
    Affected if Version is below 12.1 (e.g., 12.0.x, 11.x, or earlier)
  3. Check watchOS version
    Open the Watch app on paired iPhone, go to General > About, or check directly on Apple Watch via Settings > General > About
    Affected if Version is below 5.1.2 (e.g., 5.1.1, 5.1.0, or earlier)
  4. Check tvOS version
    Go to Settings > General > About > Version on Apple TV
    Affected if Version is below 12.1.1 (e.g., 12.1.0, 12.0.x, or earlier)

Your environment is affected if any Apple device runs an OS version lower than 12.1 for iOS, 10.14.2 for macOS, 12.1.1 for tvOS, or 5.1.2 for watchOS.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Upgrade available Upgrade to 5.1.2 / 10.14.2 / 12.1 or later
Fixed in 5.1.210.14.212.1
Interim mitigation

Apply the available security updates: iOS 12.1 or later, watchOS 5.1.2 or later, tvOS 12.1.1 or later, or the respective macOS Security Updates 2018-003/2018-006 for High Sierra and Sierra.

Fix this in Iphone Os Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing1.0 h
  • Review / QA1.0 h
5.0 hours of engineering $890
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Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2018-4427 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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