SafariWeb browser · Apple
CVE-2018-4088
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 · uneditedAn issue was discovered in certain Apple products. iOS before 11.2.5 is affected. macOS before 10.13.3 is affected. Safari before 11.0.3 is affected. iCloud before 7.3 on Windows is affected. iTunes before 12.7.3 on Windows is affected. tvOS before 11.2.5 is affected. watchOS before 4.2.2 is affected. The issue involves the "WebKit" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site.
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 · high confidenceThis is a memory corruption vulnerability in the WebKit rendering engine affecting multiple Apple products (iOS, macOS, Safari, iCloud, iTunes, tvOS, and watchOS). Remote attackers can achieve arbitrary code execution or cause denial of service by tricking users into visiting crafted malicious websites.
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
< 11.0.3
Ubuntu LinuxOperating system
= 16.04= 17.10< 11.2.5< 11.2.5< 10.13.3< 4.2.2< 7.3< 12.7.3CVSS 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 macOSOpen Safari, click Safari menu > About Safari, or run 'defaults read /Applications/Safari.app/Contents/Info CFBundleShortVersionString' in TerminalAffected if Version is lower than 11.0.3
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Check iOS version on iPhone/iPadGo to Settings > General > About, note the Version number (e.g., 11.2.4)Affected if iOS version is lower than 11.2.5
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Check macOS versionClick Apple menu > About This Mac, note the macOS version (e.g., 10.13.2)Affected if macOS version is lower than 10.13.3
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Check tvOS version on Apple TVGo to Settings > General > About > Version on the Apple TV deviceAffected if tvOS version is lower than 11.2.5
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Check watchOS version on Apple WatchOpen Watch app on paired iPhone, go to General > About, note watchOS versionAffected if watchOS version is lower than 4.2.2
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Check iTunes or iCloud for Windows versionsOpen iTunes > Help > About iTunes, or open iCloud control panel > Account, note version numbersAffected if iTunes is lower than 12.7.3 or iCloud is lower than 7.3
You are affected if any of Safari, iOS, macOS, tvOS, watchOS, iTunes, or iCloud (Windows) installed on your systems is below the respective version thresholds and users can browse the web.
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 data4.2.27.310.13.3
Apply the vendor-supplied updates: iOS 11.2.5+, macOS 10.13.3+, Safari 11.0.3+, iCloud 7.3+ (Windows), iTunes 12.7.3+ (Windows), tvOS 11.2.5+, and watchOS 4.2.2+. Prioritize user-facing browsers and devices with direct internet exposure.
Fix this in Safari
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-4088 — 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-2018-4088 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
- No spam, self-promotion, credentials, or personal data