CVE-2016-4657VulnerabilityPublished 05/24/2022Updated 10/24/2026

CVE-2016-4657: Apple iOS Webkit Memory Corruption Vulnerability

Affects Apple iOSSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 05/24/2022
KEV deadline: 06/14/2022
EPSS: 66.8% chance of exploitation in 30 days – higher than 99% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2016-4657 (opens in a new tab)

Description

A memory corruption vulnerability in Apple iOS WebKit allows remote attackers to execute code or cause denial-of-service via crafted web content. This affects HTML parsers using WebKit, including Apple Safari and other products relying on WebKit. Exploits have been observed in the wild. No specific affected versions or patch information is provided.

Summary

CVE-2016-4657 is a memory corruption vulnerability in Apple iOS WebKit that enables remote code execution or denial-of-service attacks through maliciously crafted websites. The flaw impacts HTML parsers that utilize WebKit, including Apple Safari and potentially non-Apple products using WebKit for HTML processing. Exploitation in the wild has been confirmed. No vendor advisory or patch details are included in the provided data.

Impact

Successful exploitation can lead to remote code execution or denial-of-service conditions on affected devices running iOS WebKit. This compromises device integrity and availability. The vulnerability is known to be exploited in the wild, increasing the risk to users.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Users and administrators should monitor official Apple security advisories for updates and apply patches promptly once available.

Weaknesses

CWE-119Buffer Errors (Memory Bounds) (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 11:42:14 UTC

Weaknesses

References

Related threats