CVE-2016-4656

Name: CVE-2016-4656
Creator: NVD / NIST
Published: 2016-08-25T21:59:01.087+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10Actively ExploitedEPSS 23.63%

Last modified Jun 17, 2026

CVE-2016-4656 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. CISA has confirmed active exploitation in the wild. EPSS estimates a 23.63% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

23.63%

97.5th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Jun 14, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apple	Iphone Os	< 9.3.5

References

http://lists.apple.com/archives/security-announce/2016/Aug/msg00000.htmlBroken Link, Mailing List, Vendor Advisory
http://www.securityfocus.com/bid/92652Broken Link, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1036694Broken Link, Third Party Advisory, VDB Entry
https://blog.lookout.com/blog/2016/08/25/trident-pegasus/Broken Link
https://support.apple.com/HT207107Release Notes, Vendor Advisory
https://www.exploit-db.com/exploits/44836/Exploit, Third Party Advisory, VDB Entry
http://lists.apple.com/archives/security-announce/2016/Aug/msg00000.htmlBroken Link, Mailing List, Vendor Advisory
http://www.securityfocus.com/bid/92652Broken Link, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1036694Broken Link, Third Party Advisory, VDB Entry
https://blog.lookout.com/blog/2016/08/25/trident-pegasus/Broken Link
https://support.apple.com/HT207107Release Notes, Vendor Advisory
https://www.exploit-db.com/exploits/44836/Exploit, Third Party Advisory, VDB Entry
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-4656US Government Resource

Timeline

Published: Aug 25, 2016
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2016-4656?

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.

How severe is CVE-2016-4656?

CVE-2016-4656 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 23.63% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2016-4656?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

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Source: NVD / NIST