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CVE-2016-4656

Apple iOS Memory Corruption

7.8 HIGHActively exploited (CISA KEV)Public exploitEPSS 23.6%
  1. Published25 Aug 2016
  2. Added to CISA KEV24 May 2022
  3. Remediation due14 Jun 2022
Actively exploited (CISA KEV)

A memory corruption vulnerability in Apple iOS kernel allows attackers to execute code in a privileged context or cause a denial-of-service (DoS) via a crafted application.

Added to KEV: 24 May 2022Federal remediation due: 14 Jun 2022

Description

The kernel in Apple iOS before 9.3.5 allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Apple iPhone OS< 9.3.5

Remediation

Fixed in
Apple iPhone OS≥ 9.3.5

References

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Frequently asked

Is CVE-2016-4656 being actively exploited?

Yes. CVE-2016-4656 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 24 May 2022.

How severe is CVE-2016-4656?

CVE-2016-4656 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 23.6% probability of exploitation.

Which products are affected by CVE-2016-4656?

Affected products include Apple iPhone OS.

How do I fix CVE-2016-4656?

Upgrade affected software to a fixed version, for example Apple iPhone OS 9.3.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2016-4656 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.