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CVE-2021-30858

HighPublished

Apple iOS, iPadOS, macOS Use-After-Free Vulnerability

Published: Aug 24, 2021
Updated: Oct 21, 2025
Assigning CNA: apple
Evidence observed: Nov 3, 2021

Primary CVSS

8.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS probability estimate

13.4%

Moderate · next 30 days

Percentile: 96.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

A use after free issue was addressed with improved memory management. This issue is fixed in iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.

Sources

ps4_8.00_vuln_pocPoC
My take on CVE-2021-30858 for ps4 8.xx
CVEREV3PoC
Proof-of-concept testing environment for CVE-2021-30858, based on Google Project Zero's root cause analysis of an in-the-wild iOS exploit.

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