CVE-2016-4657
Apple iOS Webkit Memory Corruption Vulnerability
- High 8.8
- Exploited: added to CISA KEV 24 May 2022
- A public exploit reference is listed
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.
Key facts
- Published
- 25 Aug 2016
- Last changed
- 21 Oct 2025
- Assigned by
- apple
- KEV added
- 24 May 2022
- KEV fix due
- 14 Jun 2022
- EPSS
- 66.788% likely to be exploited in the next 30 days, higher than 99.304% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 8.8CVSS 3.1, Highfrom CISA (ADP container)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a |
|
Timeline
- 25 Aug 2016 Published
- 24 May 2022 CVE-2016-4657 added to CISA KEV
- 24 May 2022 Added to the CISA KEV catalogue