CVE-2016-4657

Name: CVE-2016-4657
Creator: NVD / NIST
Published: 2016-08-25T21:59:02.15+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10Actively ExploitedEPSS 66.79%

Last modified Jun 17, 2026

CVE-2016-4657 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. WebKit in Apple iOS before 9.3.5 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.. CISA has confirmed active exploitation in the wild. EPSS estimates a 66.79% chance of exploitation in the next 30 days.

Description

WebKit in Apple iOS before 9.3.5 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

66.79%

99.2th 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/92653Broken 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.youtube.com/watch?v=xkdPjbaLngEExploit
http://lists.apple.com/archives/security-announce/2016/Aug/msg00000.htmlBroken Link, Mailing List, Vendor Advisory
http://www.securityfocus.com/bid/92653Broken 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.youtube.com/watch?v=xkdPjbaLngEExploit
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-4657US Government Resource

Timeline

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

Frequently Asked Questions

What is CVE-2016-4657?

WebKit in Apple iOS before 9.3.5 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.

How severe is CVE-2016-4657?

CVE-2016-4657 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 66.79% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2016-4657?

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.

Are you affected by CVE-2016-4657?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST