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

HIGH 8.8EXPLOITED (CISA KEV)CVE-2021-30858 · Published 24/08/2021 · updated 17/06/2026

Apple iOS, iPadOS, macOS Use-After-Free Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 03/11/2021. Patch affected systems as an emergency.

Package	Affected versions	Patched versions
iOS, iPadOS, and macOS Apple	Versions not published yet (product named by CISA KEV)

Description

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.

References

seclists.org/fulldisclosure/2021/Sep/25 · Mailing List
seclists.org/fulldisclosure/2021/Sep/27 · Mailing List
seclists.org/fulldisclosure/2021/Sep/29 · Mailing List
seclists.org/fulldisclosure/2021/Sep/38 · Mailing List
seclists.org/fulldisclosure/2021/Sep/39 · Mailing List
seclists.org/fulldisclosure/2021/Sep/50 · Mailing List
openwall.com/lists/oss-security/2021/09/20/1 · Mailing List
openwall.com/lists/oss-security/2021/10/26/9 · Mailing List
openwall.com/lists/oss-security/2021/10/27/1 · Mailing List
openwall.com/lists/oss-security/2021/10/27/2 · Mailing List
openwall.com/lists/oss-security/2021/10/27/4 · Mailing List
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BO6DMTHZR57JDBOXPSNR2MKDMCRWV265 · Release Notes
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XYNV7ASK4LQVAUMJXNXBS3Z7RVDQ2N3W · Release Notes
support.apple.com/en-us/HT212804 · Third Party Advisory
support.apple.com/en-us/HT212807 · Third Party Advisory
support.apple.com/kb/HT212824 · Third Party Advisory
debian.org/security/2021/dsa-4975 · Mailing List
debian.org/security/2021/dsa-4976 · Mailing List
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2021-30858

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