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SafariWeb browser · Apple

CVE-2016-4760

MEDIUM · 6.5 CVSS v3.0 Published 2016-09-25
Fix available
A fix is available. Upgrade to after 12.4.3 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
WebKit in Apple iOS before 10, iTunes before 12.5.1 on Windows, and Safari before 10 allows remote attackers to conduct DNS rebinding attacks against non-HTTP Safari sessions by leveraging HTTP/0.9 support.

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

WebKit fails to properly apply DNS rebinding protections to non-HTTP Safari sessions, allowing remote attackers to exploit HTTP/0.9 support to conduct DNS rebinding attacks that can bypass same-origin policy protections.

MitigationUpdate to iOS 10, iTunes 12.5.1 for Windows, and Safari 10 or later to obtain the patched WebKit that properly handles DNS rebinding for non-HTTP sessions.

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
ItunesApplication
Affected:<= 12.4.3
Iphone OsOperating system
Affected:<= 9.3.5

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:3.0/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. Check Safari version on macOS
    Open Safari, click Safari menu, select About Safari. Note the version number displayed.
    Affected if Version is 9.1.3 or earlier (check if <= 9.1.3)
  2. Check iTunes version on Windows or macOS
    Open iTunes, click Help menu, select About iTunes. Note the version number displayed.
    Affected if Version is 12.4.3 or earlier (check if <= 12.4.3)
  3. Check iOS version on iPhone or iPad
    Open Settings app, go to General > About. Note the version number next to Version.
    Affected if Version is 9.3.5 or earlier (check if <= 9.3.5)
  4. Identify WebKit-based browsers using HTTP/0.9
    Review installed browsers and applications that use WebKit for non-HTTP sessions (such as local file access or custom protocols). Check if they connect to servers using older protocols.
    Affected if WebKit-based applications process non-HTTP requests using HTTP/0.9 compatibility without proper DNS rebinding protection

You are affected if any Safari installation is version 9.1.3 or earlier, any iTunes installation is version 12.4.3 or earlier, or any iOS device is version 9.3.5 or earlier, and the browser processes non-HTTP sessions.

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 12.4.3
Interim mitigation

Update to iOS 10, iTunes 12.5.1 for Windows, and Safari 10 or later to obtain the patched WebKit that properly handles DNS rebinding for non-HTTP sessions.

Fix this in Safari Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,860
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.

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-2016-4760 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