dbcve.org
SafariWeb browser · Apple

CVE-2024-27838

MEDIUM · 6.5 CVSS v3.1 Published 2024-06-10
Fix available
A fix is available. Upgrade to 1.2 / 10.5 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
The issue was addressed by adding additional logic. This issue is fixed in Safari 17.5, iOS 16.7.8 and iPadOS 16.7.8, iOS 17.5 and iPadOS 17.5, macOS Sonoma 14.5, tvOS 17.5, visionOS 1.2, watchOS 10.5. A maliciously crafted webpage may be able to fingerprint the user.

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

This is a user fingerprinting vulnerability in WebKit (Apple's browser engine). A malicious webpage could exploit insufficient logic to collect device/browser information that allows tracking users without cookies. The fix adds validation logic to prevent fingerprinting techniques.

MitigationUpdate affected devices to Safari 17.5, iOS/iPadOS 16.7.8+, 17.5+, macOS Sonoma 14.5+, tvOS 17.5+, visionOS 1.2+, or watchOS 10.5+ as appropriate.

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:< 17.5
IpadosOperating system
Affected:< 16.7.8>= 17.0, < 17.5
Iphone OsOperating system
Affected:< 16.7.8>= 17.0, < 17.5
macOSOperating system
Affected:>= 14.0, < 14.5
TvosOperating system
Affected:< 17.5
VisionosOperating system
Affected:< 1.2
WatchosOperating system
Affected:< 10.5

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
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

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. Identify your Apple product and operating system
    Determine whether you are using Safari on macOS, iOS, iPadOS, or a native app that uses WebKit. For Safari, open Safari > About Safari. For iOS/iPadOS, go to Settings > General > About. For macOS, go to System Settings > General > About. For tvOS/visionOS/watchOS, check the Settings app under General or About.
    Affected if The product uses WebKit as its browser engine (Safari, or any app using WebKit)
  2. Check your Safari version on macOS
    Open Safari and select Safari > About Safari. Note the version number displayed (e.g., 17.4).
    Affected if Safari version is earlier than 17.5 on macOS
  3. Check your iOS or iPadOS version
    Go to Settings > General > About on your iPhone or iPad. Note the iOS/iPadOS version number.
    Affected if iOS or iPadOS version is earlier than 16.7.8, OR is 17.0 through 17.4 (any version less than 17.5 but greater than or equal to 17.0)
  4. Check your macOS version
    Go to System Settings > General > About, or run 'sw_vers' in Terminal. Note the macOS version (e.g., 14.4).
    Affected if macOS version is 14.0 through 14.4 (any version >= 14.0 but < 14.5)
  5. Check tvOS, visionOS, or watchOS versions
    On Apple TV, go to Settings > General > About. On Apple Vision Pro, go to Settings > General > About. On Apple Watch, open the Watch app on iPhone and go to General > About.
    Affected if tvOS version is earlier than 17.5, visionOS version is earlier than 1.2, or watchOS version is earlier than 10.5

You are affected if your Safari browser version is below 17.5, or your iOS/iPadOS version is below 16.7.8 or between 17.0-17.4, or your macOS version is between 14.0-14.4, or your tvOS/visionOS/watchOS version falls below the respective thresholds listed.

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.

dbcve · scoped
Upgrade available Upgrade to 1.2 / 10.5 / 14.5 or later
Fixed in 1.210.514.5
Interim mitigation

Update affected devices to Safari 17.5, iOS/iPadOS 16.7.8+, 17.5+, macOS Sonoma 14.5+, tvOS 17.5+, visionOS 1.2+, or watchOS 10.5+ as appropriate.

Recommended fix High confidence

Upgrade to Safari 17.5, iOS 16.7.8/17.5, iPadOS 16.7.8/17.5, macOS Sonoma 14.5, tvOS 17.5, visionOS 1.2, or watchOS 10.5 depending on device

  1. Identify the Apple device and operating system in use (iPhone, iPad, Mac, Apple Watch, Apple TV, or Apple Vision Pro)
  2. For iPhone/iPad: Go to Settings > General > Software Update and install the available update
  3. For Mac: Open System Settings > General > Software Update and install the available update
  4. For Apple Watch: Open the Watch app on iPhone, go to My Watch > General > Software Update
  5. For Apple TV: Go to Settings > System > Software Updates > Update Software
  6. For Apple Vision Pro: Go to Settings > General > Software Update
  7. After updating, verify the version matches the fixed release: Safari 17.5, iOS 16.7.8/17.5, iPadOS 16.7.8/17.5, macOS Sonoma 14.5, tvOS 17.5, visionOS 1.2, or watchOS 10.5
Caveat Standard OS update considerations apply - ensure backups exist and review app compatibility before updating

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Safari Scoped from the published advisory
  • Consultation1.0 h
  • Implementation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
4.0 hours of engineering $750
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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-2024-27838 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