CVE-2021-30818

A type confusion issue was addressed with improved state handling. This issue is fixed in iOS 14.8 and iPadOS 14.8, tvOS 15, iOS 15 and iPadOS 15, Safari 15, watchOS 8. Processing maliciously crafted web content may lead to arbitrary code execution.

• CWE-843

• http://www.openwall.com/lists/oss-security/2021/12/20/6Mailing List, Third Party Advisory
• https://support.apple.com/en-us/HT212807Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT212814Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT212815Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT212816Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT212819Release Notes, Vendor Advisory
• https://support.apple.com/kb/HT212869Vendor Advisory
• http://www.openwall.com/lists/oss-security/2021/12/20/6Mailing List, Third Party Advisory
• https://support.apple.com/en-us/HT212807Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT212814Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT212815Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT212816Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT212819Release Notes, Vendor Advisory
• https://support.apple.com/kb/HT212869Vendor Advisory

Published

Oct 28, 2021

Last Modified

Jun 17, 2026

Status

Modified

• 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.
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• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2021-30811This issue was addressed with improved checks. This issue is…5.5
• CVE-2021-30813This issue was addressed with improved checks. This issue is…6.5
• CVE-2021-30814A memory corruption issue was addressed with improved input …7.8
• CVE-2021-30815A lock screen issue allowed access to contacts on a locked d…2.4
• CVE-2021-30816The issue was addressed with improved permissions logic. Thi…2.4
• CVE-2021-30817A permissions issue was addressed with improved validation. …5.5
• CVE-2021-30819An out-of-bounds read was addressed with improved input vali…5.5
• CVE-2021-30820A logic issue was addressed with improved state management. …9.8
• CVE-2021-30821A memory corruption issue was addressed with improved memory…7.8
• CVE-2021-30823A logic issue was addressed with improved restrictions. This…6.5
• CVE-2021-30824A memory corruption issue was addressed with improved state …7.8
• CVE-2021-30825This issue was addressed with improved checks. This issue is…7.8