Live › vulnerability › CVE-2021-30666
Go to dashboardApple iOS WebKit has a buffer overflow that is triggered when the browser engine processes crafted web content. An attacker who gets a victim to load a malicious page can run code on the device.
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 iOS | vendor | – | – |
Check the iOS version on the device under Settings > General > About; compare it with the fixed release in Apple's security notes (unknown from sources).
Update iOS to a release that includes the Apple fix for CVE-2021-30666 (exact version unknown from sources); apply updates per vendor instructions as CISA requires.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Apple iOS WebKit contains a buffer-overflow 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-2021-30666")
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.