SafariWeb browser · Apple
CVE-2018-4213
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 · low confidenceA vulnerability in multiple Apple products (iOS, Safari, iCloud for Windows, tvOS, watchOS, iTunes) before their 2018 updates allows an unexpected interaction to trigger an ASSERT failure, indicating improper bounds checking or state validation that can be triggered via specific inputs.
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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Check Safari version on macOS or iOSOn macOS: click Safari > About Safari. On iOS: Settings > General > About > Version. Compare the version number to 11.1 (Safari) or 11.3 (iOS Safari component).Affected if Safari version is below 11.1, or iOS version is below 11.3 (which includes the vulnerable Safari component)
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Check iTunes version on WindowsOpen iTunes > Help > About iTunes. Compare the version to 12.7.4.Affected if iTunes version is below 12.7.4
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Check iCloud for Windows versionOpen iCloud > click the gear icon > About iCloud. Compare the version to 7.4.Affected if iCloud for Windows version is below 7.4
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Check tvOS versionOn Apple TV: go to Settings > General > About > Version. Compare to 11.3.Affected if tvOS version is below 11.3
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Check watchOS versionOn Apple Watch: open the Watch app on iPhone > General > About > watchOS version. Or on Watch go to Settings > General > About. Compare to 4.3.Affected if watchOS version is below 4.3
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Check WebKitGTK version on Ubuntu LinuxRun `dpkg -l | grep webkit` or `apt show libwebkit2gtk-4.0-37` (version number varies by release) to find the installed webkit package version. Compare to 2.22.0.Affected if WebKitGTK (libwebkit2gtk) version is below 2.22.0, or the package version corresponds to the Ubuntu 18.04 webkit package which is vulnerable
A user is affected if any of their installed Apple software (Safari, iOS, tvOS, watchOS, iCloud, iTunes) or WebKitGTK on Linux is below the fixed versions listed in the affected ranges.
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 patches: update iOS to 11.3+, Safari to 11.1+, iCloud for Windows to 7.4+, tvOS to 11.3+, watchOS to 4.3+, and iTunes for Windows to 12.7.4+.
Fix this in Safari
Scoped from the published advisory
- Consultation1.0 h
- Implementation2.0 h
- Testing1.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,424.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-4213 — 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-2018-4213 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