Apple iOS, iPadOS, and macOS WebKit Remote Code Execution Vulnerability

CRITICAL 9.8EXPLOITED (CISA KEV)CVE-2021-1870 · Published 02/04/2021 · updated 17/06/2026

Apple iOS, iPadOS, and macOS WebKit Remote Code Execution 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
webkitgtk webkitgtk	`< 2.30.6`	`2.30.6`

Description

A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..

References

lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN6ZOD62CTO54CHTMJTHVEF6R2Y532TJ · Broken Link
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU · Broken Link
security.gentoo.org/glsa/202104-03 · Third Party Advisory
support.apple.com/en-us/HT212146 · Release Notes
support.apple.com/en-us/HT212147 · Release Notes
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2021-1870

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