CVE-2016-4656: Apple iOS Memory Corruption Vulnerability

CVE-2016-4656 · Severity: critical · CVSS 7.8 · Exploited in the wild · Published 2022-05-24

A memory corruption vulnerability (specifically an out-of-bounds write) in the Apple iOS kernel allows a crafted application to execute arbitrary code with elevated privileges or cause a denial of service. This vulnerability was notably used as part of the 'Trident' exploit chain.

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

Quick answers

Is CVE-2016-4656 exploited in the wild?
Yes. CVE-2016-4656 is known to be exploited in the wild, first recorded on 24 May 2022. Treat it as urgent.
How severe is CVE-2016-4656?
Critical severity, with a CVSS score of 7.8, published 24 May 2022.
Which products and versions are affected?
Apple iOS before 9.3.5.
Is there a fix for CVE-2016-4656?
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-2016-4656 attacked?
It is attacked with local access, in an operating system.
Am I affected by CVE-2016-4656?
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

Timeline

  • 2016-08-25: disclosed: Public disclosure of Trident/Pegasus exploit chain by Lookout and Citizen Lab.
  • 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.
  • exploited: Reported as exploited in the wild as part of the Pegasus spyware attacks.

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