CVE-2016-4657: Apple iOS Webkit Memory Corruption Vulnerability

CVE-2016-4657 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2022-05-24

WebKit in Apple iOS contains a memory corruption vulnerability (out-of-bounds write) that allows remote attackers to execute arbitrary code or cause a denial of service via a crafted website. This vulnerability was famously exploited as part of the 'Trident' exploit chain used by the Pegasus spyware.

Technologies: Apple iPadOS, Apple macOS, Apple watchOS, Cisco IOS. Vendors: Apple, Cisco.

Quick answers

Is CVE-2016-4657 exploited in the wild?
Yes. CVE-2016-4657 is known to be exploited in the wild, first recorded on 24 May 2022. Treat it as urgent.
How severe is CVE-2016-4657?
Critical severity, with a CVSS score of 8.8, published 24 May 2022.
Which products and versions are affected?
Apple iOS before 9.3.5; Apple WebKit before 9.3.5.
Is there a fix for CVE-2016-4657?
A patch was published on 2016-08-25: Apple released iOS 9.3.5 to address the vulnerability. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2016-4657 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2016-4657?
Check whether you run Apple iPadOS, Apple macOS, Apple watchOS or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Apple iOS before 9.3.5
  • Apple WebKit before 9.3.5

Timeline

  • 2016-08-25: disclosed: Public disclosure of Trident/Pegasus exploit chain.
  • 2016-08-25: patched: Apple released iOS 9.3.5 to address the vulnerability.
  • 2022-05-24: kev added: Added to CISA Known Exploited Vulnerabilities Catalog.
  • 2016-08-25: exploited: Reported as exploited in the wild by Lookout/Citizen Lab.

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