CVE-2021-30663

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.

• CWE-190
• CWE-190

• https://support.apple.com/en-us/HT212335Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT212336Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT212341Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT212532Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT212534Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT212335Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT212336Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT212341Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT212532Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT212534Release Notes, Vendor Advisory
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30663Third Party Advisory, US Government Resource

Published

Sep 8, 2021

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

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• CVE-2021-30659A validation issue was addressed with improved logic. This i…6.5
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• CVE-2021-30662This issue was addressed with improved checks. This issue is…7.3
• CVE-2021-30664An out-of-bounds write issue was addressed with improved bou…7.8
• CVE-2021-30665A memory corruption issue was addressed with improved state …8.8
• CVE-2021-30666A buffer overflow issue was addressed with improved memory h…8.8
• CVE-2021-30667A logic issue was addressed with improved validation. This i…5.4
• CVE-2021-30668This issue was addressed with improved checks. This issue is…4.6
• CVE-2021-30669A logic issue was addressed with improved state management. …5.5