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SafariWeb browser · Apple

CVE-2016-4762

HIGH · 8.8 CVSS v3.0 Published 2016-09-25
Fix available
A fix is available. Upgrade to after 9.3.5 or later.
See remediation →
95/100
Remediation priority · Urgent
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
WebKit in Apple iOS before 10, iTunes before 12.5.1 on Windows, iCloud before 6.0 on Windows, and Safari before 10 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) 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 confidence

A memory corruption vulnerability in WebKit allows remote attackers to execute arbitrary code or cause denial of service by tricking users into visiting crafted malicious websites. The vulnerability affects multiple Apple products including iOS, iTunes, iCloud, and Safari.

MitigationApply vendor updates: upgrade iOS to version 10 or later, iTunes to 12.5.1 or later, iCloud for Windows to 6.0 or later, and Safari to version 10 or later.

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:<= 9.1.3
Iphone OsOperating system
Affected:<= 9.3.5
IcloudApplication
Affected:= 5.2.1
ItunesApplication
Affected:= 12.4.3

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
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 checks

Work through these to decide whether this CVE applies to you.

  1. Check Safari version on macOS
    Open Safari, click Safari menu > About Safari. The version number is displayed in the window.
    Affected if Version is 9.1.3 or earlier (versions 9.0 through 9.1.3 are vulnerable)
  2. Check iOS version on iPhone or iPad
    Open Settings app > General > About. The version number is displayed next to 'Version'.
    Affected if Version is 9.3.5 or earlier (iOS 9.x versions up to and including 9.3.5 are vulnerable)
  3. Check iTunes version on Windows or macOS
    Open iTunes, then on Windows press Ctrl+B to show the menu bar or on macOS use the menu bar. Click Help > About iTunes. The version number is displayed.
    Affected if Version is 12.4.3 (this specific version is vulnerable)
  4. Check iCloud for Windows version
    Open iCloud for Windows, click the gear icon or Help > About iCloud for Windows. The version number is displayed.
    Affected if Version is 5.2.1 (this specific version is vulnerable)

A user is affected if they run Safari 9.1.3 or earlier, iOS 9.3.5 or earlier, iTunes 12.4.3, or iCloud for Windows 5.2.1.

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.

From vendor data
Upgrade available Upgrade to a release after 9.3.5
Interim mitigation

Apply vendor updates: upgrade iOS to version 10 or later, iTunes to 12.5.1 or later, iCloud for Windows to 6.0 or later, and Safari to version 10 or later.

Fix this in Safari Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.

Scan for this in your stack

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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-2016-4762 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