CVE-2021-30762VulnerabilityPublished 11/03/2021Updated 10/24/2026

CVE-2021-30762: Apple iOS WebKit Use-After-Free Vulnerability

Affects Apple iOSSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 11/03/2021
KEV deadline: 11/17/2021
EPSS: 11.0% chance of exploitation in 30 days – higher than 95% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2021-30762 (opens in a new tab)

Description

CVE-2021-30762 is a use-after-free vulnerability in Apple iOS WebKit that can lead to code execution when processing maliciously crafted web content. This affects HTML parsers using WebKit, including Apple Safari and other products relying on WebKit. The vulnerability has been exploited in the wild. No specific affected versions or patch information is provided in the input data.

Summary

Apple iOS WebKit contains a use-after-free vulnerability (CWE-416) that allows remote attackers to execute arbitrary code by processing specially crafted web content. This vulnerability impacts WebKit-based HTML parsers, including Apple Safari and potentially other non-Apple products using WebKit. Exploitation has been observed in the wild, indicating active threat usage. The input data does not specify affected versions or patch availability.

Impact

Successful exploitation of this vulnerability can result in arbitrary code execution on affected devices running iOS, potentially allowing attackers to take control of the device or execute malicious payloads. The vulnerability has been exploited in the wild, confirming its practical impact.

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-416Use After Free (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 09:41:17 UTC

Weaknesses

References

Related threats