CVE-2021-30663
Apple macOS
Published 8 Sept 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 3 Nov 2021, with a remediation deadline of 17 Nov 2021 for US federal agencies.
Required action: Apply updates per vendor instructions.
Description
An integer overflow was addressed with improved input validation. This issue is fixed in iOS 14.5.1 and iPadOS 14.5.1, tvOS 14.6, iOS 12.5.3, Safari 14.1.1, macOS Big Sur 11.3.1. Processing maliciously crafted web content may lead to arbitrary code execution.
References
- support.apple.com/en-us/HT212335 · Release Notes, Vendor Advisory
- support.apple.com/en-us/HT212336 · Release Notes, Vendor Advisory
- support.apple.com/en-us/HT212341 · Release Notes, Vendor Advisory
- support.apple.com/en-us/HT212532 · Release Notes, Vendor Advisory
- support.apple.com/en-us/HT212534 · Release Notes, Vendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30663 · Third Party Advisory, US Government Resource