Live › vulnerability › CVE-2021-30661
Go to dashboardA use-after-free bug in WebKit's storage code in Apple iOS, iPadOS, macOS, tvOS, watchOS and Safari lets a crafted web page run code. It is listed in CISA's Known Exploited Vulnerabilities catalog, so attacks have been seen in the wild.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 3h before NVD. All times on this page are UTC.
Apply updates per vendor instructions.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Apple Multiple Products | vendor | – | – |
Check the installed OS and Safari versions against Apple's security release notes for CVE-2021-30661 (unknown which build fixed it in the sources).
Update iOS, iPadOS, macOS, tvOS, watchOS and Safari to a release that includes Apple's fix (fixed version unknown in the sources).
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Apple iOS, iPadOS, macOS, tvOS, watchOS, and Safari WebKit Storage contain a use-after-free vulnerability that leads to code execution when processing maliciously crafted web content. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.
CISA required action: Apply updates per vendor instructions.
This page as .md · .json · in your agent: get_signal("CVE-2021-30661")
CISA KEV catalog, Creative Commons 0 · EPSS scores by FIRST, used with attribution · NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.