CVE-2021-1789
Apple iOS and iPadOS, Apple macOS
Published 2 Apr 2021 · updated 17 Jun 2026 · Analyzed
8.8 High · CVSS 3.1, NVD
Exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on 4 May 2022, with a remediation deadline of 25 May 2022 for US federal agencies.
Required action: Apply updates per vendor instructions.
Description
A type confusion issue was addressed with improved state handling. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, tvOS 14.4, watchOS 7.3, iOS 14.4 and iPadOS 14.4, Safari 14.0.3. Processing maliciously crafted web content may lead to arbitrary code execution.
References
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN6ZOD62CTO54CHTMJTHVEF6R2Y532TJ/ · Broken Link, Mailing List
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/ · Broken Link, Mailing List
- security.gentoo.org/glsa/202104-03 · Third Party Advisory
- support.apple.com/en-us/HT212146 · Release Notes, Vendor Advisory
- support.apple.com/en-us/HT212147 · Release Notes, Vendor Advisory
- support.apple.com/en-us/HT212148 · Release Notes, Vendor Advisory
- support.apple.com/en-us/HT212149 · Release Notes, Vendor Advisory
- support.apple.com/en-us/HT212152 · Release Notes, Vendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1789 · US Government Resource