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SafariWeb browser · Apple

CVE-2018-4409

MEDIUM · 6.5 CVSS v3.0 Published 2019-04-03
Fix available
A fix is available. Upgrade to 7.8 / 12.0.1 or later.
See remediation →
72/100
Remediation priority · Elevated
Remotely reachable 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 resource exhaustion issue was addressed with improved input validation. This issue affected versions prior to iOS 12.1, tvOS 12.1, Safari 12.0.1, iTunes 12.9.1, iCloud for Windows 7.8.

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 resource exhaustion vulnerability in Apple's ecosystem (iOS, tvOS, Safari, iTunes, iCloud for Windows) that was addressed through improved input validation, allowing attackers to potentially cause denial of service through malformed input.

MitigationUpdate affected Apple products to iOS 12.1 or later, tvOS 12.1 or later, Safari 12.0.1 or later, iTunes 12.9.1 or later, and iCloud for Windows 7.8 or later.

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
SafariWeb browser
Affected:< 12.0.1
Iphone OsOperating system
Affected:< 12.1
TvosOperating system
Affected:< 12.1
IcloudApplication
Affected:< 7.8
ItunesApplication
Affected:< 12.9.1

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

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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 Safari version on macOS
    Open Safari, click Safari menu, select 'About Safari' - the version number appears in the dialog window
    Affected if Version is earlier than 12.0.1
  2. Check iOS version on iPhone or iPad
    Open Settings app, go to General > About, look at the 'Version' field
    Affected if Version is earlier than 12.1
  3. Check tvOS version on Apple TV
    Go to Settings > General > About > Version on the Apple TV device
    Affected if Version is earlier than 12.1
  4. Check iTunes version on Windows or Mac
    Open iTunes, click Help > About iTunes - the version displays in the window
    Affected if Version is earlier than 12.9.1
  5. Check iCloud for Windows version
    Open iCloud for Windows, click the menu icon (three lines) and select 'About iCloud'
    Affected if Version is earlier than 7.8

A user is affected if any of their Apple products (Safari, iOS, tvOS, iTunes, or iCloud for Windows) is running a version lower than the fixed releases (12.0.1 for Safari, 12.1 for iOS/tvOS, 12.9.1 for iTunes, 7.8 for iCloud).

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 7.8 / 12.0.1 / 12.1 or later
Fixed in 7.812.0.112.1
Interim mitigation

Update affected Apple products to iOS 12.1 or later, tvOS 12.1 or later, Safari 12.0.1 or later, iTunes 12.9.1 or later, and iCloud for Windows 7.8 or later.

Fix this in Safari Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.

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-2018-4409 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