CVE-2021-30858

webkitgtk: Use-after-free leading to arbitrary code execution

Published Aug 24, 2021 CVSS 3.1 · 8.8 High EPSS 13.4% KEV · Listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DSA Debian DSA DSA-4975-1 webkit2gtk security update
Debian DSA Debian DSA DSA-4976-1 wpewebkit security update
EUVD EUVD EUVD-2021-17775 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.
Ubuntu USN Ubuntu USN USN-5087-1 WebKitGTK vulnerabilities
Weaknesses

Sources

Status
PUBLISHED
Assigner
apple
Published
Updated
Oct 21, 2025, 11:25 PM
Reserved
Apr 13, 2021, 12:00 AM
Status
Analyzed
Published
Aug 24, 2021, 7:15 PM
Modified
Jun 17, 2026, 3:51 AM
Severity
Moderate
Public date
Sep 20, 2021, 12:00 AM