CVE-2018-4149
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 11.3 is affected. The issue involves the "SafariViewController" component. It allows remote attackers to spoof the user interface via a crafted web site that leverages input into a partially loaded page.
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 UI spoofing vulnerability in the SafariViewController component on iOS devices running versions prior to 11.3. Attackers can craft malicious websites that present a spoofed user interface to users by manipulating input during the page loading process, potentially tricking users into believing they are interacting with a legitimate site.
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< 11.3CVSS 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 the iOS version on the deviceOn the iOS device, go to Settings > General > About and look at the 'Version' field to determine the installed iOS version number.Affected if The displayed version number is lower than 11.3 (for example, 11.2.6, 11.2.5, 11.1.2, etc.)
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Determine if SafariViewController is in useSafariViewController is used by Safari and by third-party apps that embed an in-app browser. Check if the device has any third-party browsers installed or apps that open web content within the app.Affected if The device runs any app that uses SafariViewController for web content, combined with an iOS version below 11.3
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Query managed devices via MDMIf the device is enterprise-managed, query the mobile device management system for the iOS version inventory of managed devices.Affected if The MDM report shows any devices running iOS versions below 11.3
A device is affected if it runs iOS version lower than 11.3 and uses Safari or any app that leverages the SafariViewController component.
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 data11.3
Update iOS devices to version 11.3 or later to remediate this vulnerability. For enterprise environments, ensure mobile device management (MDM) policies enforce minimum OS version requirements.
- Consultation1.0 h
- Testing1.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2018-4149 — 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-2018-4149 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