CVE-2021-1867

An out-of-bounds read was addressed with improved input validation. This issue is fixed in iOS 14.5 and iPadOS 14.5, macOS Big Sur 11.3. A malicious application may be able to execute arbitrary code with kernel privileges.

• CWE-125

• https://support.apple.com/en-us/HT212317Vendor Advisory
• https://support.apple.com/en-us/HT212325Vendor Advisory
• https://support.apple.com/en-us/HT212317Vendor Advisory
• https://support.apple.com/en-us/HT212325Vendor Advisory

Published

Sep 8, 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.
• 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-2021-1871A logic issue was addressed with improved restrictions. This…9.8
• CVE-2021-1872A logic issue was addressed with improved state management. …4.3
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• CVE-2021-1874A logic issue was addressed with improved state management. …8.8