CVE-2016-4657
KEVApple iOS Webkit Memory Corruption Vulnerability
Description
Apple iOS WebKit contains a memory corruption vulnerability that allows attackers to execute remote code or cause a denial-of-service (DoS) via a crafted web site. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.
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.
CVSS 3.1 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HPublishedAug 25, 2016
Last modifiedJun 17, 2026
Added to KEVMay 24, 2022
Remediation dueJun 14, 2022
References
- lists.apple.com/archives/security-announce/2016/Aug/msg00000.htmlBroken LinkMailing List
- securityfocus.com/bid/92653Broken LinkThird Party Advisory
- securitytracker.com/id/1036694Broken LinkThird Party Advisory
- blog.lookout.com/blog/2016/08/25/trident-pegasus/Broken Link
- support.apple.com/HT207107Release NotesVendor Advisory
- exploit-db.com/exploits/44836/ExploitThird Party Advisory
- youtube.com/watch?v=xkdPjbaLngEExploit
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-4657US Government Resource
0 recent articles mention this CVE
81
Risk assessment · Critical
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1596 days
- CVSS
- 8.8 HIGH
- EPSS (30-day exploit probability)
- 66.8% · top 1% of all CVEs
- Weakness
- CWE-787
- Attack vector
- Network, remotely reachable
Recommended actions
- 1.Apply updates per vendor instructions.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.