CVE DATABASE / CVE-2016-4657
CVE-2016-4657
Apple iOS Webkit Memory Corruption Vulnerability
CVSS 8.8 · HIGH
⚠ CISA KEV — ACTIVELY EXPLOITED
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2022-05-24.
Federal remediation due 2022-06-14.
Required action: Apply updates per vendor instructions.
Summary
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 breakdown
| Base score | 8.8 (HIGH) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| Attack vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | REQUIRED |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity | HIGH |
| Availability | HIGH |
Weakness type (CWE)
Affected products
Apple iphone os
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References
- http://lists.apple.com/archives/security-announce/2016/Aug/msg00000.html
- http://www.securityfocus.com/bid/92653
- http://www.securitytracker.com/id/1036694
- https://blog.lookout.com/blog/2016/08/25/trident-pegasus/
- https://support.apple.com/HT207107
- https://www.exploit-db.com/exploits/44836/
- https://www.youtube.com/watch?v=xkdPjbaLngE
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-4657
Data: NIST NVD + CISA KEV. NVD last modified 2026-04-21. Always verify against the vendor advisory before acting.