SafariWeb browser · Apple
CVE-2018-4207
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 · uneditedIn iOS before 11.3, Safari before 11.1, iCloud for Windows before 7.4, tvOS before 11.3, watchOS before 4.3, iTunes before 12.7.4 for Windows, unexpected interaction causes an ASSERT failure. This issue was addressed with improved checks.
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 confidenceA vulnerability in multiple Apple products (iOS, Safari, iCloud, tvOS, watchOS, iTunes) before their 11.3/11.1/7.4/4.3/12.7.4 releases allows an unexpected interaction to trigger an ASSERT failure, causing potential denial of service or unexpected termination. The fix implemented improved checks to prevent this condition.
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
< 11.1
Ubuntu LinuxOperating system
= 18.04< 11.3< 11.3< 4.3< 7.4< 12.7.4< 2.22.0CVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/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 checksWork through these to decide whether this CVE applies to you.
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Identify WebKit-based applications in useList installed browsers and applications that use WebKit rendering engine (Safari, WebKitGTK browsers, iOS apps with web views)Affected if Any WebKit-based browser or application is running on an affected product version
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Check Safari version on macOSOpen Safari, go to Safari > About Safari, or run 'defaults read /Applications/Safari.app/Contents/Info CFBundleShortVersionString' in TerminalAffected if Version is below 11.1
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Check iOS version on iPhone/iPadGo to Settings > General > About on the iOS device and note the Version numberAffected if iOS version is below 11.3
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Check tvOS version on Apple TVGo to Settings > General > About > Version on Apple TVAffected if tvOS version is below 11.3
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Check watchOS version on Apple WatchOpen Watch app on paired iPhone, go to My Watch > General > AboutAffected if watchOS version is below 4.3
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Check WebKitGTK version on LinuxRun 'dpkg -l | grep webkit' or 'webkit2gtk-4.0 --version' or 'rpm -qa | grep webkit' depending on package managerAffected if webkit2gtk or webkitgtk version is below 2.22.0
Your environment is affected if any WebKit-based application (Safari, iOS, tvOS, watchOS, or WebKitGTK browsers) is running a version below the fixed releases (Safari 11.1+, iOS/tvOS 11.3+, watchOS 4.3+, WebKitGTK 2.22.0+).
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 data2.22.04.37.4
Apply vendor-supplied updates: iOS 11.3+, Safari 11.1+, iCloud for Windows 7.4+, tvOS 11.3+, watchOS 4.3+, iTunes 12.7.4 for Windows. No custom code remediation is required.
Fix this in Safari
Scoped from the published advisory
- Consultation2.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-4207 — 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-2018-4207 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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