CVE-2016-4657Apple iOS Webkit Memory Corruption Vulnerability

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.

8.8 HIGHEPSS 66.78%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-06-17 00:47 UTC

OverviewCVSS details

8.8HIGHCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Aug 25, 2016
Assigner: apple

Affected

iphone os (apple)

Versions: before 9.3.5
Fixed in: 9.3.5

Exploitation

Public exploit: Yes · 2 references
CISA KEV: Listed · May 24, 2022
KEV due date: Jun 14, 2022
Ransomware use: Unknown
SSVC: Exploitation active · Automatable no · Impact total

EPSS · FIRST, scored Nov 7

66.78%chance of exploitation in 30 days

Higher than 99.29% of CVEs

CVSS 3.1 · NVD

8.8High

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 impact: High
Integrity impact: High
Availability impact: High

CVSS 2.0 · NVD

6.8Medium

AV:N/AC:M/Au:N/C:P/I:P/A:P

Attack vector: Network
Attack complexity: Medium
Authentication: None
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
8.8	HIGH	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8	MEDIUM	2.0NVD	AV:N/AC:M/Au:N/C:P/I:P/A:P

CISA required action

⚡ Known exploited · remediation due Jun 14, 2022

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Details

CVE ID: CVE-2016-4657
Status: Analyzed
Assigner (CNA): apple
Published: Aug 25, 2016
Last modified: 2026-06-17 00:47 UTC
Weaknesses: CWE-787
CWE-119

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 13:57 UTC.