Live › vulnerability › CVE-2021-1871
Go to dashboardA logic flaw in WebKit, the browser engine used by Safari and Apple's iOS, iPadOS and macOS, lets a remote attacker run code. Any app that parses HTML with WebKit can be hit, and CISA lists it as actively exploited.
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, iPadOS, and macOS | vendor | – | – |
Check the device OS version under Settings > General > About (iOS/iPadOS) or About This Mac (macOS) and compare it with the Apple security release that fixed CVE-2021-1871.
Update iOS, iPadOS and macOS to a release that includes the WebKit fix for CVE-2021-1871, per Apple's security notes.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Apple iOS, iPadOS, and macOS WebKit contain an unspecified logic vulnerability that allows a remote attacker to execute code. 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-2021-1871")
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.